Have questions or want to discuss cycling? Join Now or Sign In to participate in the BikeRide community.

New: Take Part in the September Giveaway to Win the Luckeep X1 Pro ebike


Non-round front gear wheel
#1
been to various mechanics but think i now need some old school knowledge.

here the sitch: i ride a Giant Stiletto which has a fixed forward chain that transfers power to a another derailured chain (like a tandem--my rig is 7 feet long). the problem is with the front, fixed chain--we've tightened it to the max (it's an elliptical crank case) but part, probable half a revolution later, it has slack in it. i've changed the axle in the crank case but this problem persists. mechanics say that the front crank wheel is off-round, and that there's no such thing as perfectly round. okay, i accept that it'll never be perfect, but not that there's nothing at all to do about it.

years ago i had a bike repair book that gave instructions on how to file the teeth on a gear wheel. i guess that was to sharpen for wear, maybe when components were made of lesser stuff.

could i somehow put a file to one side of my front gear wheel to bring it closer to round? who can tell me how to accomplish this without making things worse, or where to find an instructional on point?

thanks,

nachum
  Reply
#2
Can you post a picture of the chainwheel? From what you tell it sounds as it it might even be a biopace chainwheel, those were elliptical for a reason... I wouldn't file it down, rather get a decent new one.
  Reply
#3
http://www.jejamescycles.com/archive/giantStilettoRed07.html

It won't have a Biopace chainset.
The chainwheel should be reasonably round. Don't have the chain too tight but it shouldn't flop about.
Ride hard or ride home alone!
  Reply
#4
(04-20-2010, 02:57 AM)Joe_W Wrote:  Can you post a picture of the chainwheel? From what you tell it sounds as it it might even be a biopace chainwheel, those were elliptical for a reason... I wouldn't file it down, rather get a decent new one.

here's one of many places to see the stiletto:

http://www.bikecyclingreviews.com/Giant_Stiletto_Its_Sharp.html - Similar

it's the crank case, not the gear wheel that's eliptical (so that tension can be set on the front chain, like a tandem)

need someone to source the old school method (lost art?) of filing a gear wheel to keep it/ bring it nearer to round.
  Reply


Possibly Related Threads...

Forum Jump:

[-]
10 Latest Posts
Northeast of India or Myanmar rides
Today 01:36 AM
New from South Florida
Yesterday 12:31 PM
Newbie from DC
10-12-2024 08:29 PM
Best Accessories for Polaris Ranger 1000...
10-12-2024 07:16 AM
Naming a bicycle - Yes or No?
10-12-2024 02:11 AM
Ketone Ester $$$
10-11-2024 05:55 PM
Energy gels for cycling
10-11-2024 05:52 PM
Change comes hard in the cycling communi...
10-11-2024 11:30 AM
COLNAGO SUPER (unknown year)
10-11-2024 08:12 AM
Broken Bottom Bracket
10-11-2024 01:26 AM

[-]
Join BikeRide on Strava
Feel free to join if you are on Strava: www.strava.com/clubs/bikeridecom

[-]
Top 5 Posters This Month
no avatar 1. Jesper
26 posts
no avatar 2. GirishH
21 posts
no avatar 3. meamoantonio
15 posts
no avatar 4. Flowrider
13 posts
no avatar 5. Painkiller
10 posts