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Stupid person needs help?(9 posts)

Stupid person needs help?William
Jan 19, 2002 9:21 AM
I have a Trek bicycle that has the teeth worn down on the chain rings. How can I tell what model the chain ring is? The only identification I can find is "Shimano IG" but I can't find any IG components listed anywhere. Can anyone help in identifying the parts or helping with what parts are compatible to replace the chainring? It's has a 4 bolt pattern with 22, 32, and 42 teeth. The bike has 7 gears in the rear. Any help would be appreciated.
re: Stupid person needs help?CFVeloDan
Jan 19, 2002 4:59 PM
If its just the front crank, and the bike isn't to old, then I would just jump for a whole new crank. Bottom bracket might need to be looked at also ( might not be sealed). cranks dont chane much over the years, rear cassettes do! Crank= 45-300$

I only know a little about bikes, but I hope I was of some help.
re: Stupid person needs help?William
Jan 20, 2002 2:22 PM
Thanks for the feedback.
Are you sure the chainrings are bad?nee Spoke Wrench
Jan 20, 2002 7:14 AM
Look exactly opposite the "worn" teeth. I'll bet you find another set of teeth exactly like them. If so, that is a feature that is designed to make the chain shift up onto the bigger ring more easily. I doubt your chainrings need replaceing.
Are you sure the chainrings are bad?William
Jan 20, 2002 2:20 PM
Thanks for the information. There are worn teeth directly opposite each other on the chain ring. I assumed (my mistake) that the reason the chain kept jumping when I put it under load (going uphill / accellerating) was because of the worn teeth and chain. Seems to work fine until under a load. Was hoping I could replace the chain ring to fix the problem. It's hard to get to a local bike shop, easier to mail order. Sounds like it needs a professional, I think I'll send it to the LBS. Thanks again.
It doesn't sound like the chain ringsKerry Irons
Jan 20, 2002 5:50 PM
If your chain is "jumping" when you put a load on it, then it is much more likely that you have some worn cogs or a worn chain or both. Having the chain actually jump teeth on a chainring is EXTREMELY unlikely. If you have replaced the chain recently, you probably had worn cogs and should have replaced them too. If both are old, replace them both. If you're talking about a problem during shifting, then ignore (possibly) the above discussion.
4 bolt ring?Rusty McNasty
Jan 20, 2002 7:53 AM
Unless this is some ancient, obsolete pattern, it is a MTB crank, not a road bike crank. Most MTB 4-bolt cranks have the same bolt pattern, so they are interchangeable.
Have you tried going to a (gasp!) BIKE SHOP???
4 bolt ring?Rusty McClueless
Jan 20, 2002 8:14 AM
Just like road cranks, there are different BCDs for normal and microdrive cranks (68/112, 64/104, even a 58/104). Rusty, stick to road bikes where you have half a clue. William, take it to a LBS and get it right.
4 bolt ring?William
Jan 20, 2002 2:24 PM
Sending it to the LBS, thanks.