Posts
1458
Joined
1/2/2011
Location
Cromwell, CT
US
Fantasy
134th
Edited Date/Time
8/28/2013 7:08am
Curious to see if there is any documentation of late model steel frames stretching over time with use? I recall in 1988 there was a Dirt Bike article that documented a maintenenace schedule of a CR250 over the course of a season. If memory serves me, there was an increase in the steering head to swingarm pivot dimension of .100". I also recall info describing RC going through frames every 2 weeks or so during his 2000=era KX250's. Does the current crop of aluminum frames break before stretching? Anyone change frames as regular maintenance?
As for the AL frames vs Steel I have seen less AL frames breaking over Steel But that being said I also broke more frames in the late 70's and early 80's than I did in the late 80's. my current 94 KX250 has more hours on it than any of my race bikes and i have only had a few minor cracks show up. As for stretch?? I have not measured it but I am sure it is a small bit longer today than the day it came off the line.
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