Where did I screw up?

Chris Burgess chris at chrisburgess.com
Tue Mar 10 09:04:38 PDT 2009

Are you sure there is no preload on those springs?  When you simply assemble
the parts with the internal spacer on the forks and the spring retainer on
the shock you have some preload on the springs.

On Tue, Mar 10, 2009 at 8:46 AM, Steve Robertson <srobertson at ssimicro.com>wrote:

> Can someone point out where I made a mistake? The answer of 60mm
> of sag doesn't match up with the reality of 35mm of sag on the bike. There
> is currently no internal or external preload on the springs. What did I
> miss?
> bike weight 360lbs
> rider weight 200lbs = 560lbs
> unsprung weight ~25lbs x 2 = ~50lbs
> total sprung weight 510lbs = ~230kg
> weight distribution 50/50, so sprung weight on front 115kg
> fork springs 2 x 0.95 kg/mm = 1.9kg/mm
> 115kg divided by1.9kg/mm should equal ~60mm of sag

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