c/bicycle-mechanics

Just hit 500 bottom bracket replacements in my shop log

I was cleaning up the work log from last year and did a count. We did exactly 500 bottom bracket jobs in 2023. It's wild because I remember thinking we'd maybe hit 300. It matters because it shows how much the new press-fit standards have taken over, and how many are failing early. We used almost 15 full tubes of Park Tool BSA-1 grease just on those. Has anyone else seen a huge jump in BB work, or is it just our area?

2 comments

river_scott•2d ago

Shoutout to the guy at the shop who said he never uses grease on carbon seatposts

Heard him tell a customer at the shop in Boulder last week that carbon paste is the only thing that works, even on clean posts. I've been using a light grease for years and had three slip this month alone. What's your go-to for carbon seatpost installs?

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elliotr39•2d ago

Serious question, do you still use a spoke tension meter?

I dropped about $120 on a Park Tool TM-1 a few years back when I was trying to get really good at wheel builds... It felt like a big step up from just plucking spokes. Honestly, it mostly sits in my box now unless I'm doing a full rebuild. For most truing jobs, I just go by feel and sound, which I learned from an old timer at a shop in Portland. Anyone else find they moved away from using one after a while?

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alicelopez•3d ago

Rant: I bought a cheap headset press and it cost me a whole afternoon

I mean, I was trying to save maybe 30 bucks and grabbed a no-name press online. The thing was so soft it bent on the first press, ruining the lower cup on a customer's carbon fork. Had to order a new cup, wait two days, and eat the cost myself, which was about 45 dollars. The whole job took like 4 hours longer than it should have because I was trying to fix my own mistake. Honestly, just get the Park Tool one, it's not even a debate. Has anyone else had a tool fail that badly on a simple job?

2 comments

taraw16•3d ago

I finally stopped using torque wrenches for every single bolt

Last week, a customer brought in a carbon seatpost I'd installed a month prior with the exact spec torque, and the binder had still slipped. Three years ago at the shop in Boulder, my mentor said 'feel is the real spec' for things like stems and posts, and I think he was right. Anyone else just go by hand feel for certain components now?

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calebw50•5d ago

Pro tip: I just read that a seized seatpost can generate over 1000 ft-lbs of torque, which is why they're so brutal to remove.

Found that stat in an old technical bulletin from Park Tool, and it explains why the 'freeze and quench' method with dry ice sometimes works when nothing else does.

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jamiebailey•7d ago

Just realized the shop's new apprentice has never seen a friction shifter

This kid came in on Tuesday asking how to adjust the 'weird lever' on a 1980s Peugeot that came in for a tune-up. I showed him the simple barrel adjuster on the downtube, and his eyes went wide. He said, 'But how do you know what gear you're in?' We spent the next hour going over friction vs. indexed, and he was totally fascinated. It was a cool reminder of how much basic tech has changed. Anyone else had to explain really old components to a new mechanic lately?

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betht19•7d ago

Rant: I was setting up a new stand in the shop last week and realized I've been doing it wrong for years.

I was mounting a customer's carbon frame and the clamp kept slipping, so I grabbed my old torque wrench to check it. The manual said 5 Nm, but my wrench hadn't been calibrated since I bought it three years ago and was reading almost 8. Has anyone else had a tool drift that much without regular checks?

2 comments

terry_bailey35•8d ago

A customer's worn-out chainring in Denver made me rethink my whole approach to wear limits

I was working at a shop in Denver about 6 months ago, and a guy brought in his gravel bike with a skipping chain. I pulled out my chain checker, and it read 0.75%, which I figured was fine. I told him the chain was okay but the cassette might be worn. He insisted I look closer at the big chainring. Sure enough, the teeth were completely hooked, like little shark fins. I'd always gone by the chain wear number as the main indicator. This bike had a relatively new chain but a totally shot ring from grinding through mud and grit. It made me realize I was putting too much faith in one tool. Now I always do a visual check on the rings no matter what the gauge says. Has anyone else had a case where the chain measurement lied to you?

2 comments

gavin_clark•9d ago

Rant: The week I had to fix 7 stripped pedal threads in a row

Every single one was a left-side crank arm from people forcing pedals, and I had to helicoil each one. Anyone got a better trick for convincing customers to use grease and go slow?

2 comments

loganburns•10d ago

That one seized seatpost that cost me a whole afternoon

A customer brought in an older steel frame road bike last week, the kind that sat in a damp garage for a decade. The alloy seatpost was completely frozen in the steel tube. I tried the usual tricks: penetrating oil left overnight, a bench vise with a pipe wrench on the post, even some gentle heat with a heat gun. Nothing budged. I ended up mixing up a 50/50 solution of automatic transmission fluid and acetone, soaking it for two full days, and then using my longest breaker bar with a cheater pipe. It finally let go with a loud crack after about four hours of total work time spread over three days. I was sure I was going to have to cut it out. Has anyone found a more reliable method for this specific steel-on-aluminum bond that doesn't risk damaging the frame?

2 comments

jaken23•11d ago

A customer at the shop argued that a $20 chain checker is a waste of money

He said you can just measure chain stretch with a ruler and that the tool is just for upselling. I've seen guys get it wrong with a ruler and wear out a whole drivetrain, though. What's your shop's policy on checking for chain wear?

2 comments

miller.avery•13d ago

The week a customer brought in a bike with a squirrel nest in the frame

This guy rolled in with a vintage steel road bike that hadn't moved in years. He said it made a 'rustling' sound when he picked it up. We took off the seatpost and a whole family of baby squirrels stared back at us from inside the seat tube. Had to very carefully tip the frame over a trash can until they all tumbled out, mom included. Has anyone else had to perform wildlife extraction as part of a tune-up?

2 comments

miller.avery•13d ago

Appreciation post: Switched to a torque wrench for carbon seatposts after a shop in Denver showed me a cracked frame.

I saw a 40% drop in seatpost slippage complaints in my shop over six months once we started using a preset 5.5 Nm for every carbon install, so has anyone else found a specific torque value that solved a recurring issue?

2 comments

elliot_hall62•14d ago

Tried two ways to set up a truing stand and the difference was huge

I've been working on wheels for my shop in Austin and always used the old cone-and-locknut method on my Park TS-2.2. Last week I tried the newer style with the quick-release skewer adapters that came with it, which I'd never bothered with before. The difference in stability was INSANE. With the old way, I'd get maybe 0.5mm of lateral wobble just from the axle shifting in the cones, especially on a lightweight carbon wheel. The QR method locked the hub body dead solid, zero play. It cut my truing time on a wobbly 29er wheel from like 45 minutes down to 20. Why did I wait so long to try the proper setup? Has anyone else found a basic tool adjustment that made a massive difference in speed or quality?

2 comments

henrygrant•14d ago

Remember when you could fix most bikes with a 15mm wrench and a screwdriver?

Had a guy bring in a 1992 Trek 950 last week, the whole drivetrain was shot. Took me maybe an hour and a half to strip it down, clean the old grease off, and put on a new chain and cassette. It was simple, everything was right there and easy to get to. Now I spend half my day just trying to get the right proprietary tool for some new integrated headset. Anyone else miss working on the old straightforward stuff?

2 comments

sarahh48•17d ago

Fixed a creaky bottom bracket after three tries with a new torque wrench

I mean, this old Trek 520 came in with a noise you could hear a block away. I cleaned and greased the threads twice, but it still sounded awful after a few rides. Finally grabbed my buddy's Park Tool TW-5.2, torqued it to exactly 35 Nm, and the creak was just gone. Has anyone else found that a specific number on the wrench makes the difference with those square taper ones?

2 comments

claire64•17d ago

A stripped seatpost bolt had me stuck in a park for an hour

I was doing a quick tune-up in the shop when a customer brought in a bike with a seized seatpost. The 4mm bolt head was completely rounded out. I ended up drilling it out carefully with a left-hand bit, which worked but was nerve-wracking. What's your go-to method for a stripped bolt when you can't just replace the whole part?

2 comments

barbara278•19d ago

I finally fixed a seized seatpost that took me two whole days

It was a steel post in an aluminum frame, totally frozen from rust. I tried everything, from a ton of penetrating oil to a bench vise and a big pipe wrench. Ended up having to carefully cut it out in sections with a hacksaw, which was a huge pain. Anyone have a better trick for this mess?

3 comments

gavincampbell•21d ago

Can we talk about the old guy at the co-op who told me to use a 2.5mm hex on a stripped 3mm bolt?

He said to tap it in hard and turn slow, and it actually worked on a stripped seatpost clamp bolt last week. I was ready to drill it out, but his trick saved the part. Has anyone else had luck with that size trick, or is it just asking for trouble?

2 comments

jackson.jenny•22d ago

Just hit 1000 bottom bracket replacements in my shop log

I always thought the press-fit ones were the biggest headache, but looking at the numbers, square taper BBs from the 90s have been the real repeat offenders for us. It's made me rethink our parts stock and what we push customers to upgrade. What's your most common 'comeback' repair that surprised you when you looked at the data?

2 comments

harperwright•22d ago

Serious question, a customer told me my brake pad alignment was 'lazy'

He brought in his gravel bike after I did a full service, pointed out that the pads were hitting the rim at a slight angle instead of square. I started using a headlamp and a white background to check every pad now, not just eyeball it. Does anyone else have a specific trick for getting that perfect vertical contact every time?

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abby_shah69•25d ago

Vent: A customer's vintage Campagnolo derailleur snapped its spring mid-shift in my stand.

I was in the middle of a tune-up when it popped, and I had to call three shops before finding a donor part from an old 80s bike. Has anyone else had luck with a specific aftermarket spring for these?

3 comments

stella_lane94•27d ago

Serious question, has anyone else switched to using a torque wrench on every stem bolt?

I was at a group ride in Bend and saw a carbon steerer tube split because someone just 'felt' the bolt was tight enough... cost the guy over $400. Now I use my Topeak wrench on every single one, no exceptions. Do you think that's overkill for aluminum parts too?

3 comments

lily97•29d ago

Just had a weird bottom bracket creak that turned out to be the chainring bolts

I was tuning up a customer's gravel bike last week, a pretty new carbon frame model, and it had this awful creak with every pedal stroke. I figured it was the usual suspect, the bottom bracket, so I pulled the crankset and checked the BB threads and cups. Everything was clean and torqued right. I was about to put it back together when I decided to check the chainring bolts on a hunch. Sure enough, three of the five were just a bit loose, maybe only 2 Nm when they should be at 8. Tightened them up, put the cranks back on, and the creak was totally gone. It's funny how a sound from the middle of the bike can trick you into thinking it's the BB. I've been doing this for a few years and still get fooled sometimes. Has anyone else had a chainring bolt creak mimic a bottom bracket issue that clearly?

3 comments