r/BikeMechanics Aug 05 '20

Visit r/bikewrench to ask for bike repair help. (This sub is for other stuff.)

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98 Upvotes

r/BikeMechanics Mar 06 '24

Show and Tell Eccentric Wheels (Eccentricycle)

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138 Upvotes

So this all started with a previous post about snowflake laced wheels (twisted spoke lacing). I asked if anyone new of any other weird lacing patterns. A fine user by the name u/Bobatt mentioned a bike with eccentric wheels. That is, hub not in the center of the rim.

Immediately I got really excited and knew this was my next dumb wheel project.

I was thinking about it for a while in my head trying to figure out how to calculate the spoke length.

There is a website that in theory has a calculator but the site must be down or not working or something. It is just a blank screen for me anyway. There was also little to no information about calculations on the internet that I could find.

Lucky, I work at a bike shop with a bunch of wheel nerds. I mentioned it to them and was met with what should be the normal response; "WTF, why?"

My coworker Jake seemed to be curious though. Lucky for me who is bad at math at best, Jake is very good at math. After many conversations about if it would even be possible to make an equation, we decided to give it an honest try.

We boiled it down to the ERD part of the equation being what we needed to focus on.

I'm not going to pretend that I knew much of the maths that happened to get the calculator but we basically had to calculate all 64 spokes individualy and figure out where they go from the hub to the rim. Easier said than done.

I voluntold my Chromag Rootdown to be the victim of this nonsense. So it is a hardtail, 29r. We didn't want the wheel to run into the frame or fork so we used 26" rims and made them have a 29" wheel path. In the equation, we called it the 'virtual ERD'. We just chose a relatively normal ERD (I think it was 604mm or something close to that) to use as a constant. We then had to use the 26" ERD for the actual spoke lenghts and figure out how to make it a 2 cross too. We wanted it to be a semi legit wheelset with disc brakes and such.

This is where my math knowledge runs out but basically smart things took place and Jake made a spreadsheet calculator.

Building was actually not too hard other than figuring out what spoke goes where. Again, 64 individually calculated spokes, all at different lengths, needing a very specific hole in the hub to go to a specific hole in the rim. Side point, our shop has a spoke cutter making it a breese to get the right length spoke.

Tensioning was easy, truing was weird. Kinda just made it tight and not too laterally untrue.

It was really fun trying to figure this one out. Mega thanks and props to Jake for doing the hard work on this one. I just had the dumb idea and sacrificed my bike.

You might be asking why spend all this time and energy to have a bike that rides like a drunk horse. To be honest, curiosity got the best of me. I've never seen a mountain bike with eccentric wheels before. I know they are out there but I wanted the experience and gained knowledge from making one. Doing a normal wheel build after this was a breeze. We though so much about how a wheel works and all that goes into calculating spoke length and ERD, it really made us appreciate wheels in a new way.

Another large part of why I wanted to do this was literally just to make people smile. As soon as I pictured how this bike would ride if I made it, I started laughing to myself. I want to spread some smiles and laughter. Bikes are meant to be fun right!? Yes it's silly and useless but it literally makes people's day riding it.

I keep the bike at work and ask our friends and good customers to ride it with no context. 10 times out of 10, their faces go from worried, to confused to pure laughter. Its totally worth it.

Anyway, I hope this peeks your curiosity too. I'm planning on taking it on trail soon. That should be interesting.

P.S. Wish I could upload a video to this post. It's the craziest looking thing ever when it's spinning. I'll post something similar and a vid to my IG if you are interested. @jaminscheif.

Bikes are fun, let's keep it that way. Do fun, weird shit.


r/BikeMechanics 8h ago

Tool Talk Shop Apron Question

8 Upvotes

I just bought a beautiful waxed canvas apron but I am finding it unbearably hot in our shop without AC in the 90°+ days. The waxed canvas is creating a vapor barrier and is just trapping sweat between my chest and the apron. Any suggestions for me?


r/BikeMechanics 2d ago

Tales from the workshop Bike shop kitchen edition

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101 Upvotes

This maybe a weird one but id like to see your shop kitchen/lunch set ups. Here is my tiny nook. I run a small rental bike touring biz by myself with a weekend guy for sat and sunday.


r/BikeMechanics 2d ago

Rant at me?! I'll rant at you!...after you hang up.

0 Upvotes

OMG, we scheduled this guy to come in with both of his ebikes (which we don't normally do for lack of space) and said we'd "get right on them" once here. But I didn't say how long it would take to do two bikes in freakin JULY. Why call us every single day and yell at us?? Like I'm not going to call asap when they're done...sheesh. Ok, rant over.


r/BikeMechanics 5d ago

Tales from the workshop OMG I Hate Malwart Kids Bikes!

29 Upvotes

All of the mass market bikes, actually.

It's so sad that people buy these BSOs. I know most people don't know better but I sure do wish people would stop buying these super shitty bikes - or at the very least - if they do buy one to immediately bring it to a proper bike shop to be made safe.

How do you guys handle these customers? I know most of them are of meager means and want to help their kids have fun, but my god, these bikes are garbage.

Do you offer cut rate labour to fix these bikes? Do you have a flat make-a-BSO-safe labour charge? Any advice?


r/BikeMechanics 5d ago

Show and Tell My new mobile repair box

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181 Upvotes

r/BikeMechanics 5d ago

Tales from the workshop I thought it running fine

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15 Upvotes

This came in a couple of days ago for a light refurb. Still on the original chain after 35 years.


r/BikeMechanics 5d ago

Mobile mechanics: What laptop / device do you use for logging things when on the road with customers?

0 Upvotes

I used to do it on a laptop which got inevitably smashed about from being bopped from vehicle to driveway to vehicle to workshop. Now I just send voicenotes and pictures over whatsapp from my phone, to a guy in the Philippines who logs the information for me. I just cannot deal with spreadsheets on my phone. In fact I find using my phone for anything at all besides for calls to be a total pain - I really need a keyboard and mouse. Obviously this is very inefficient and I'm just wondering what solution others have found.


r/BikeMechanics 7d ago

What is being a bicycle mechanic like and is there anything i should know?

33 Upvotes

Im 17 in my last year of high school and am looking at maybe becoming a bike mechanic after school as I have always loved hands on problem solving stuff such as fixing my, my friends and my brothers bikes (dual sus, dirtjumper, hardtail, etc). If anyone out there is a professional mechanic is there any hard realities or peices of advice I should know?


r/BikeMechanics 7d ago

Advanced Questions Pressing drive ring into hub seat

2 Upvotes

I'm attempting to fix a RaceFace Trace J624 hub. There was a batch produced a few years back that had a common defect.

As noted in this thread (with images), the drive ring was not fully seated into the hub shell during manufacture. I'm wondering if it's possible to fully seat it in its current state. From the pictures and diagrams, it appears to be retained only with an interference fit, but I'm ignorant of how this style hub is assembled by the OEM.

I do have two obvious concerns about the OEM assembly that might make the repair impossible, but I'm deliberately not mentioning them to avoid prompting AI-generated guesses. Anyone with firsthand knowledge of the assembly process would recognize them immediately, and anyone who's attempted the repair would have discovered them.

I have access to a full machine shop, so I can make a drift and press it in, but the drive ring is (presumably) hardened (brittle).

I did contact RF support, and they were unable to offer any insight on the repair. I am interested in fixing the issue, not warranty. Resolving this may help others with the same issue.


r/BikeMechanics 7d ago

Wanted: Beefy 48h bmx rims (20"), qty 2.

2 Upvotes

Preferably Sun Big City, Ditch Witch or similar. Eyeletted preferred. Used in good condition ok too. Not much out there at my numerous distributors. Just paid retail (fortunately low margins on BMX parts) for some Gusset Black Dogs as they were delayed at BTI.


r/BikeMechanics 8d ago

Service and training center research

3 Upvotes

Hey all,

I am looking for advice/wisdom/warnings on a possible move into opening a service center. I am very familiar with working in shops and have owned my own coaching business for years but have never owned my own brick and mortar business. It would be based around repair service with some side services like coaching, Indoor training, strength training, performance testing, bike fitting, (maybe rentals seasonally?), and potentially some ride guiding services. The motive is to run a shop with multiple services and with as little overhead as possible. So, little to no retail.

Some back ground.

I live in Western, MA. The town I live in has no bike shop. The town it's self is one of if no the fastest growing towns in the area and we have seen a mass of high income residents and a lot of new bike riders. We have tons of trails all within riding distance from down town and a bike path that runs through the middle of town that gets a ton of use.

Before I raced as a professional for 12yrs I was a mechanic and service manager in bike shops in FL, MA, OR and DC. I am in a transition period now and looking to open my own shop. I am a full time cycling coach to WC level athletes as well as every day athletes. I currently provide bike fits, strength training and skills sessions on top of my online coaching. TBH, I am trying to jump on name recognition while I still have it!

My questions are: * If it looks like a statement I am looking for a Good idea or bad idea opinion.

  1. Have you opened or run a service only shop? What has your experience been like? Did you also have other services like I listed above?

  2. Buy or rent a space?

  3. Does this type of business need a "store front" or foot traffic? Would more parking and a bigger space like an industrial unit be a better option? I am leaning toward the latter.

  4. My plan is to buy used as much as possible. I have enough tools at home to do basic repairs and some more specific stuff but would need a better suite of tools over time. My current plan is to purchase what I need and then charge up-front for repairs and order tools ad hoc.

  5. My plan would be to start with hiring 1x full time mechanic and have me float for everything else. Eventually hiring on a second fitter/Coach.,The having a strength coach, PT and massage as contract workers that can have their own booking spots online. I would take a fee based off of the end rates.

  6. Insurance: I see that there is "bike shop" specific insurance. Does that apply to something like this? Is there a company you like working with?

  7. In your opinion, is it better to go with a bank financed or private cash financed operation. By that I mean, I have some offers from a few potential cash partners. It seems like it might not matter a whole lot in this case, maybe I am wrong.

  8. Part of my plan is to have indoor training in the winter. I live in Western, MA and we get some real sloppy winters. The last shop I worked at we have a Compu-trainer room and it was a big hit. That being said, it was pre-Zwift etc. IS there a scenario where I can get someone to drive to my shop to train with other people/me?

  9. Subscription services. Has anyone had luck with services that pay up front like; Flat fixes for life( A shop locally had this at one time. $50 or something and they get free flat LABOR for life.) Tune up services like buy 4 get 1 free or a service plan with one tune up and 24hr turnaround on other services throughout the year/ free safety checks etc... , Bike fitting plans that include service work or any such things?

  10. POS system- The good the bad and the useless.

  11. Last one- Part of my plan is to find someone I WANT to work for me. For example- I would take someone who needs training over a more entitled mechanic. I mean no disrespect by this and I am sure you see what I am saying... I have a level of professionalism and respectability I am shooting for. I would rather have a kind and responsible person willing to learn than the other way around.

I am sure I am missing a thousand other things. Thanks in advance for everyone's time and thoughts.


r/BikeMechanics 9d ago

Does anyone take photos of leaking shocks?

9 Upvotes

Weird question but yeah. For some reason theres been like 10 people come in without their bike or their bike cleaned and ask me if their shock is leaking.

Half of the time them explaining what it looks like doesn't really help when I dont have a shock to look at, and the other times they dont want me to just service it without knowing if its truly leaking.

Im going to print a couple photos of shocks that are normal, shocks that could be of concern and shocks that are leaking.

So if any of you guys have photos from your shop or home please if you can, leave them in the comments.

Thanks all


r/BikeMechanics 9d ago

What do you replace Tourney derailleurs with?

1 Upvotes

Accera or Altus deraileurs with 7 speed shifters?

Do you get old used Deore, 105, etc?


r/BikeMechanics 10d ago

Sram Transmission derailleur possibly dead?

5 Upvotes

I have a bike in with an unresponsive transmission derailleur. Customer said it was hit with a stick that went into the spokes.

There's no obvious damage other than wear and tear scuff marks. The battery is good and tested with the dropper. The shifter is good and working.

The button on the derailleur does nothing. Single click, double clicking and holding the button. no response, no servo buzz, no light.

I've followed the sram reset guides and still no joy.

Any tips?


r/BikeMechanics 10d ago

Help me build a better option for bike shops

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0 Upvotes

Hey legends - I've been working with a couple bike shops in Australia on an alternative to some of the crazy expensive shop management softwares out there.

We started off just wanting something more reasonably priced, that reflected how seasonal shops can be, but we've landed on something we think is just better.

Some of what we've already got.

  • Booking functions for Services, Fittings, Workshops, Tours and Bike Rental
  • A full suite of features for mobile mechanics, including in- and out-of app routing
  • Multi-staff management
  • Apps for iOS and Android both on the way, with mobile app already live.
  • Inventory management and quoting, based on existing catalogues and POS
  • Two-way messaging over SMS and email
  • Custom features for clients.

Pricing wise, we charge $1 per booking. No percentage-of-booking, no monthly fee, no secret charges. All features are included in your costs. more features added when you need them.

Would love to hear from the group on what they like, what they need, what's missing, and if we can help you save time + money on the management front. Check us out at https://velobook.app/, or hit me up here / at [[email protected]](mailto:[email protected]) for more details.

And if it sucks, let us know too. We're building it to be better, and so want to know what makes it better.


r/BikeMechanics 11d ago

DAE fixate on hyper-specific details like the right amount of cable throw?

10 Upvotes

Or is that just me?


r/BikeMechanics 13d ago

Service Manager Interview

12 Upvotes

Service Managers out there, what’s something you wish you knew before going into your first interview? I’m interviewing for a service manager/lead mechanic role for the first time and I want to avoid rookie mistakes. Thanks for the help!


r/BikeMechanics 14d ago

maybe a weird question

28 Upvotes

I am curious if any other mechanics who raw dog (use no gloves) while working on bikes have this issue:

it seems that when I go to work, I just have crazy bowel movements -- diarrhea -- multiple times a day. I always thought it was my diet, which honestly doesnt help, but then I started realizing that on my rare days off, I would have solid BMs, when I was eating similarly. I've since started using gloves while I work, and it seems like it's helped.

Have y'all who don't wear gloves while working have similar experiences? am I crazy? I'm convinced it's the PFAs leaching into my body and sending my body over, and have found some journals that kind of, loosely (no pun intended), confirm it, but wanted to see if anyone else has noticed this, and or would maybe like to encourage those of us who don't like gloves to start wearing them.

anyways. I love PFAs


r/BikeMechanics 14d ago

What shoes do you wear at work?

6 Upvotes

Looking for recommendations on footwear at work. I’m not looking to buy steel-toe but something hardwearing, comfortable and black. Ideally good for cycling in flat pedals too without feeling too cushiony.

Average about 10,000k steps during a shift. Big shop, juggle workshop and sales etc.

UK based so options available here preferred.

Open to spend £50-£100

Thanks all!


r/BikeMechanics 15d ago

Tales from the workshop Is anybody else dealing with this type of sh*t?

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53 Upvotes

Had to change and tension 7 chains on this side by side bike, 3 of which connected to the same hub. I had to use half links and all my luck for the rest of the year, to get them properly tensioned.


r/BikeMechanics 15d ago

Tool Talk Bespoke tools

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25 Upvotes

Its been a while since anyone posted about weird and interesting tool brands. There was some fabulous suggestions on the original post here but its time for an update! Throw your favourite tools/ brands in the comments :)

The more niche, the better!


r/BikeMechanics 15d ago

Clik valve fatal failure mode

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3 Upvotes

r/BikeMechanics 17d ago

Bike shop business advice 🧑‍🔧 Considering opening rental biz

5 Upvotes

Tossing around the idea of opening a small bike/ebike rental business and wanted to see if anyone here had thoughts or opinions.

We live next to a relatively new 4 mile paved riverside walking trail that attracts ~200,000 visitors a year. The trail is not very long, but is part of a much larger (approved) trail plan that will connect the three neighboring towns and, down the road, eventually connect to a much larger metro trail network.

There are no existing rental shops anywhere in town, and anyone who is already a cyclist brings their own bike to the trail, so I would plan on catering to a more casual, family oriented crowd (think cruisers, slow class 1 e bikes, child trailers, etc.)

A few unorganized thoughts:

- I like the idea of a hands-off CitiBike type bike rack that is automated, but this is probably a major stretch. I would also need to find a nearby business to rent space for the rack (or perhaps town hall would rent me a parking spot near the trailhead). Visibility and easy-access to the trail seem key to this plan.

- I have a truck to haul bikes back and forth, I can also jump onto the trail through the woods in my backyard if one gets ditched.

- Probably start small and see if it's profitable, advertise on FB groups and have a sign on the trail bulletin boards.

- I do not plan on having a shop space until the trail expands. Minimum overhead is my plan. I work full time (mostly WFH within a mile of either end of the trail) but I could see this being a side hustle my wife operates eventually.

Obviously I will need to look into an LLC or S-corp and some type of liability insurance, but I'm wondering if anyone here runs a profitable rental company? Any tips? Thanks!