Morning all.
My scenario: Just bought an 06 stumpjumper fsr with the brain. Shocks been recently serviced and had Kashima coated shaft. Problem being the shatf is 50mm long instead of what should be 44mm. How is this gonna affect the performance and in what way ie head angle rear travel ect. Asking coz if this set up is ok i was gonna get rid of brain and fit a 190x50 rp2/rp3 as be using bike for work duties too. Any help would be much appreciated. Thanks
Assuming that you mean that the eye to eye length of the shock is now 6mm longer but that the travel is the same, it'll steepen the head angle and raise the BB. It probably won't significantly affect the amount of travel.
You'd have to do the maths to work out how much (or compress the shock by 6mm and measure...)
travel for me not an issue, been riding hardtails for the last five years so plenty of travel for me just dont know if it puts any extra stress on the frame. Rides fine just dont like the bobbing really
It's unlikely to cause any significant extra stress.
If it's same eye to eye but longer shaft then you may get problems
If your saying the shaft is 6mm longer, well thats multiplied by the leverage ratio of your bike, not sure what yours is. Might be 3 to 1 or 2 to 1 you will have to look it up. So that 6mm is 2 or 3 or x times of travel movement.
Make sure the shock fits in eye to eye without fouling the frame when compressed/extended.
Assuming your frame will allow this amount of movement without it fouling, you just need to set the sag correctly.
If there was no suspension, the extra 4mm will alter the geometry. But as the shock squashes with you on it and you set the sag properly, then the extra 4mm is taken up.
Cheers for the advice men
So, it's come back from a service with an incorrect shaft length on it then?
Who serviced it? Ask them, and ask them to rectify the problem!