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newbie: Lateral Frame Movement while on trainer?(4 posts)

newbie: Lateral Frame Movement while on trainer?pomole
Jan 26, 2004 7:04 AM
this may be a silly question but i just got a magnetic indoor trainer and noticed some lateral movement of the bottom bracket area of my frame while pedalling. its not much, maybe less 1/4" at the most. is this normal? i have never noticed any "unusual" flex on my frame but that is probably because i have my head up and am watching the road. the bike feels perfectly fine, but have never really seen now much flex is actually happening on my bike when i ride. i just want to make sure im not on a defective frame or anything.

btw: i ride a cannondale 2001 r600.

thanks in advance for your feedback.

-pom.
re: newbie: Lateral Frame Movement while on trainer?lyleseven
Jan 26, 2004 7:49 AM
not unusual at all... wait til you try to stand up and pedal!
The trainer is flexing...biknben
Jan 26, 2004 7:58 AM
A 1/4" is no big deal at all. Like Lyle said, Wait till you stand up and really start cranking.

The trainer only holds the frame by the skewer. The pedaling forces cause some twisting of the trainer's frame. It's most noticeable at the BB area because you
i think
everything should be still.

Nothing to be concerned with.
re: newbie: Lateral Frame Movement while on trainer?pomole
Jan 26, 2004 5:31 PM
thanks for the feedback. i asked a roadie co-worker and he agreed it was normal. he said "its one of those things that you should be glad it happens. if it didn't do this, the frame would probably break."

-pom.