Timeline for Replaced left crank arm but still comes loose?
Current License: CC BY-SA 3.0
18 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| May 11, 2016 at 19:24 | history | tweeted | twitter.com/StackBicycles/status/730478729852551171 | ||
| May 9, 2016 at 20:39 | comment | added | Adam | I ended up using the peddle wrench to turn the hexagonal head of the thread extractor around the bolt. | |
| May 9, 2016 at 18:44 | comment | added | Adam | I have access to this tool kit tinyurl.com/hyskqhg . The only tool which seems to fit around the hexagonal bolt which keeps coming loose is this imgur.com/Hf7QK5R , but it provides no leverage for tightening to the recommended 35-40Nm, does this tool have a different function to what I think or perhaps it connects to some other item in the tool box to make a lever? | |
| May 9, 2016 at 8:17 | comment | added | Batman | I guess the worst thing you can do is ruin the threads in the bottom bracket, in which case you'd probably use a universal BB (e.g. the velo orange). Using Torque = Force x Arm, you can figure out roughly how much 35-40 Nm feels like, if you don't use a torque wrench. I'd suggest using a wrench in the 2 foot range. You can also look up the appropriate torques in the documentation for the bike. | |
| May 9, 2016 at 8:10 | comment | added | Batman | There are good instructions on how to do the replacement on parktool.com , so provided you can follow them and have access to the right tools, you can do it yourself. But given how often this repair needs to be done, I don't think its a particularly valuable skill to have. In some cases when things get stuck though, you will want a properly stocked shop (so you have a real repair stand rather than a portable repair stand, and a longer breaker bar than most home people will have access to). | |
| May 9, 2016 at 6:59 | vote | accept | Adam | ||
| May 8, 2016 at 18:10 | comment | added | Adam | I'd prefer to do any maintenance myself (for the purposes of learning), I might be able to borrow the appropriate tools off of a friend. Is this a good idea, or is there a high chance of damaging the bike further if I attempt to do this? | |
| May 8, 2016 at 18:07 | comment | added | Batman | You need about 35 to 40 N-m to tighten a crank typically. That's probably more than you think you need. I'd let the shop do the whole thing, since you'll probably use them to do the BB anyway. | |
| May 8, 2016 at 18:03 | comment | added | Adam | So I need to buy a torque wrench and a new BB? Yikes, so much for buying a cheap bike. | |
| May 8, 2016 at 17:45 | comment | added | Alexander | Too short wrench. You need something about 40cm length, and yet you need much power to tighten it well. And as Batman answered, you probably damaged the BB spindle. | |
| May 8, 2016 at 17:28 | comment | added | Adam | Would that be a problem? The handle on the wrench I'm using is about 15-20 cm long (I'm trying to estimate from memory). | |
| May 8, 2016 at 17:26 | comment | added | ojs | It sounds like you need a longer wrench. | |
| May 8, 2016 at 17:22 | comment | added | Adam | I tightened it as much as physically possible without breaking my arm. | |
| May 8, 2016 at 17:19 | history | edited | ojs | CC BY-SA 3.0 |
Grammar. And peddle, c'mon.
|
| May 8, 2016 at 17:18 | comment | added | ojs | Did you tighten the crank enough? If you don't have a torque wrench, the correct torque is really tight. If it doesn't feel like something is about to give, you are doing it wrong. | |
| May 8, 2016 at 16:12 | answer | added | Batman | timeline score: 2 | |
| May 8, 2016 at 15:45 | review | First posts | |||
| May 8, 2016 at 22:05 | |||||
| May 8, 2016 at 15:45 | history | asked | Adam | CC BY-SA 3.0 |