Changing shock size. What's advantages/disadvantages?

[PARUS]

Hi,

I just thinking to play with shock size. Sorry due to lack of english I tried to show all my thinking in picture. Please, correct me if I'm wrong...




PS: There is no my bike. Sorry....

[squirrel_hunter]

I'm not an expert but...

From my understanding points 1 + 2 are correct. If you raise the rear ride height you will effect the geometry (rake and trail) which will result in a faster turning, but reduced stability in a straight line. By how much depends on the difference in length of the shock that you are using. When I started playing around with my bikes suspension I took a look at some of the work that Tony Foale has done. Very interesting, worth a read and the programs to calculate rake and trail etc are useful as this is what you are altering.

As for point 3 you are incorrect. The firmness of the suspension is controlled by the stiffness of the spring, the damping rates (compression and rebound) and the pre load settings. Altering any of these will make the ride more or less hard. But I'm not a setup expert.

[PARUS]

I'm not an expert but...

From my understanding points 1 + 2 are correct. If you raise the rear ride height you will effect the geometry (rake and trail) which will result in a faster turning, but reduced stability in a straight line. By how much depends on the difference in length of the shock that you are using. When I started playing around with my bikes suspension I took a look at some of the work that Tony Foale has done. Very interesting, worth a read and the programs to calculate rake and trail etc are useful as this is what you are altering.

As for point 3 you are incorrect. The firmness of the suspension is controlled by the stiffness of the spring, the damping rates (compression and rebound) and the pre load settings. Altering any of these will make the ride more or less hard. But I'm not a setup expert.

How much reasonable changes shock size? I have checked and shock with size 310mm or maybe more will fit.

[squirrel_hunter]

It really depends on what you want to gain from doing this?

If its quicker turning then drop the forks through the yokes, there should be some information here on what is considered the best amount.

[PARUS]

Found following about suspension set-up.

http://www.gostar-racing.com/club/motor ... set-up.htm

[yeurman]

I run my bikes on different geometry, . wheel base is 135 mm on dry bike and 162mm on wet bike, with the dry bike having a 150mm spring and the wet 170mm spring. would be rude for me to give any more details... hope this helps. Col (NC29)

[PARUS]

I run my bikes on different geometry, . wheel base is 135 mm on dry bike and 162mm on wet bike, with the dry bike having a 150mm spring and the wet 170mm spring. would be rude for me to give any more details... hope this helps. Col (NC29)

Thank you mate.. will check this on mine soon..

[PARUS]

I run my bikes on different geometry, . wheel base is 135 mm on dry bike and 162mm on wet bike, with the dry bike having a 150mm spring and the wet 170mm spring. would be rude for me to give any more details... hope this helps. Col (NC29)

Did you change wheel base just changing shock size? Correct ?

[PARUS]

I run my bikes on different geometry, . wheel base is 135 mm on dry bike and 162mm on wet bike, with the dry bike having a 150mm spring and the wet 170mm spring. would be rude for me to give any more details... hope this helps. Col (NC29)

I have changed wheel base little bit with help shock height adjustment.