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Simple question I suppose.....
If I reduced my fork travel from 130mm to 120mm on same bike would I need to compensate and raise stem/bar by 10mm to maintain my position?
Thanks
Simple answer - yes.
More complex answer would involving reach increasing due to the bar moving down and forward, amount of sag decreasing, head angle increasing, and so on.... I don't honestly know.
It's not likely to make that much difference. Maybe put another spacer under the stem if you can.
I assumed the answer was yes.
It was the lack of steerer above the stem that prompted the question. So stem with some rise or bars with more rise if need be then.
If you like - personally I'd ride it as it is with the 10mm shorter fork and see how you go. You can always run a little less sag to bring the dynamic ride height of the forks up a little.
Bars with more rise will add a little reach too, as they add vertical height to the hand position.
But I'd do what Paul says. Ride it for a bit and see how it feels.
Why are you reducing the travel?
It wouldn't really be 10mm though. Assuming you run the same percentage of sag. For example if you run 25% sag:
With 130mm, sag is 32.5mm
With 120mm, sag is 30mm.
So the bars unwieghted at 120mm start 10mm lower but once at 25% sag they will only be 7.5mm lower than before the reduction in travel.
Unless my late night maths is wrong.
Id be impressed if you could notice a sagged difference of circa 8mm... don't think i would and, if could, it'd only be swapping 1 or 2 steerer spacers or maybe rotating the bar slightly
It'll be even less than 8mm height due to the head angle not being vertical.
I doubt I'd notice it but there will be those who will claim they can.
In fact the whole bike will rotate slightly forward so the angles and BB height will change.
I can notice when I remove 5mm of spacer or if the angle of my stem changes by 4 degrees. However it wouldn't bother me and I would just get used to it within a ride.
I'd say no. The relative position of all your contact points hasn't changed. The saddle is lower the bottom bracket is lower