-
- CommentAuthorOGCollard
- CommentTimeSep 18th 2013
So I rebuilt my Peugeot into single speed with aluminum crank. I am 250 lbs. When I power into the pedal stroke it feels like my cranks are pulsing in and out through the pedal stroke. When I am just pedaling along and not putting them under a load. I have uninstalled and reinstalled twice. The arms are on straight and the pedals are too. Could I be heavy enough that I am flexing the crank arms to cause this? -
- CommentAuthorsocal3rensho
- CommentTimeSep 18th 2013
still a road and track crank with a road chain, or all 1/8" track parts. What model Peugeot? Tubing? frame size?
If you are that big and not shaped like a cannonball I'm guessing a 56 minimum, and quite possible much larger. Even a high end road is not designed liked a true track or even a low end fixed gear, throw in a moderately big ratio and hammer it, your going to feel all kinds of torsion, flex and "oddness" -
- CommentAuthorOGCollard
- CommentTimeSep 18th 2013
1/8 inch chain and crank. 76 Peugeot uo8 I believe. 46t chainring. I believe 1.25 to 1.5 inch tubing. Down tube is 23 inches long. Funny thing is I do not recall feeling that flex before the conversion. -
- CommentAuthorsocal3rensho
- CommentTimeSep 19th 2013
if all else is the same it would be a result of the frame flexing. I'm betting if you would have put the same starting effort into the bike in a similar gear, you would have noticed the same result.
You're sure the BB is properly adjusted as well? -
- CommentAuthorOGCollard
- CommentTimeSep 19th 2013
Well, I did have LBS put the bottom bracket in. Everything looks flush and straight on it. It was a french thread velo orange grand cru bottom bracket. I really honestly think it may be just my size since it goes away when not under a load. Plu, I notice when I put my feet in a little closer to the crank arm on the pedal it causes a big reduction in it. I did notice the frame actually flexing so I was thinking that was prolly it. -
- CommentAuthorsocal3rensho
- CommentTimeSep 19th 2013 edited
if you are hammering with your feet fairly outboard on some platform pedals that answers everything, Hope your crotch is not exposed to a snapped crankarm!
By the way, what brand and crank arm length? -
- CommentAuthorOGCollard
- CommentTimeSep 20th 2013
Yes. Big platforms. That would cause those crank arms to bend a little or the plastic housing of the pedal to bend causing that misaligned feeling wouldn't it? I am actually going to get some smaller welgo pedals and see if that makes a difference. Snapped crank arm would lead to painful crotch bashing on top tube I spose. Btw they r lake 165 mm crank set 46t. Not the best but not the worst crank set. -
- CommentAuthorOGCollard
- CommentTimeSep 20th 2013
Pake. Not lake -
- CommentAuthorsocal3rensho
- CommentTimeSep 20th 2013
If you were doing this on some Dura Ace 165 I'd be scared to meet you! -
- CommentAuthorOGCollard
- CommentTimeSep 20th 2013
Would the dura ace be tougher? I have 16t freewheel but gonna change to 17t -
- CommentAuthorsocal3rensho
- CommentTimeSep 21st 2013
its what the majority of pros and nearly all Kierin racers run, but the frame and wide set of the platforms will have more of an effect. -
- CommentAuthorOGCollard
- CommentTimeSep 22nd 2013
It was totally the pedals. Put new pedals on and everything is straight as arrow. Thanks for your input! -
- CommentAuthorsocal3rensho
- CommentTimeSep 22nd 2013
Like Archimedes said, "give me a long enough lever and I'll flex the shit out of this Peugeot!" Or something like that.
1 to 13 of 13