I have a 2004 Specialized Allez, with all stock components. A few weeks ago I noticed the crank shearing, and today it just decided to break cleanly off.
I saw that the chainring has 5 screws on them, so I thought maybe I could replace the middle part, but I haven't been able to find that part at all. I was also thinking of changing the crankset to a two-speed Sora, but I fear that I might have to buy a whole bottom bracket for it. I really don't want to splurge because I am a college student, what should I do?
Any help is appreciated! Thank you all in advance.
by therealozp
12 Comments
Oh yeah, that old crank is scrap aluminum now
You are better off just changing the lot. If you change to the new 2 speed you will need a different bottom bracket, it’s a different mounting for the crank set. You will probably need a new shifter as there is no guarantee that the double will work with your triple shifter, though you may be lucky. If you are looking to do it on a budget just get a second hand triple from somewhere like eBay
Yes, you need a new crankset. Those chainrings are completely worn too.
Edit: big ring is worn, smaller rings might be fine. Your chain looks like it’s really worn too.
Yes. If the failure didn’t cause you to crash consider yourself lucky.
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Yep, its gone. Sadly.
There are people making tall bikes by welding two frames together, one on top of the other, requiring a sort of tandem style drivetrain. For that purpose this armless crank could actually be useful as a ‘dummy stoker’ drive on the lower frame’s bracket. Being a triple ring model it would be possible to connect the top-down chain on the innermost ring and use the outer ring for the chain driving the rear wheel. Not my thing but it’s better or more fun than throwing this away!
Edited to add: would need a new outer ring in that case, anyway
Yes, you also need a new chain.
It’s very possible to just find the matching lone crank arm on eBay.
If you want pedals for both legs you’ll want a new crankset
You dont need anything. This is why there are two arms for redundantcy.
Based on the questions you are asking, I’m going to make the assumption you have limited knowledge and I’d advise that you’d be best placed going to a bike shop and have them source and fit the part. Crank and bottom bracket standards and sizes are a rabbit hole thats easy to waste time and money buying, and trying to fit and setup the wrong thing.
Based on the year, its likely a very common standard that should be cheap to replace by someone that knows what they are doing. Its also not worth upgrading unless it works out cheaper. If you can find a bicycle shop/mechanic that supplies used parts, it could be even cheaper.
EDIT: sorry if that sounds patronising or condescending. Just trying to be pragmatic.