So i recently had to get new forks for my crf100f i got a good deal on a set of forks that are 4 inches longer so i currently have those on. i was wondering how to raise the back up 4 inches to match the front and if it is possible to fit a 21 inch front rim and a 19 inch rear rim with the new set up.

Very hard to achieve without spending a bit of cash to be honest but it can be done. From what understand there is limited lift on the current rear shock linkage. If you remove the rear shock while it is on a stand, not a side stand, you will see what I mean. Without the shock in lower the rear swing arm and it bottoms out on the frame quickly. Well at least that is true for the xr100. I cannot be sure about the CRF. I have heard the term around here called an aussie lift but not sure what that is. I would assume it is some sort of alteration.

You would have to extend the swing arm to accept the 19" rim/tire.

Aussie Lift relocates the link point on the frame.  This is only good for about 1/2 - 1".

4 inches of increased rear suspension is not done without compromise; the extreme angle of the swing arm will wear drive components (chain, guides) quickly.

Ray.... looks good. Best looking XR100 I have seen but it just goes to show that the old XR can look good.

ok so im not gana bother with the bigger tires... to much work for me. so basicly 4 inches isnt possible stock but is there any extended swing arms that would add some height to the thing and im ok with spending some money but not thousands of dollars

I don't know about the extended swing arms. I would make one. Perhaps raymondo can answer this better.

alright how would i make one just take a old one cut it and add in however much metal i need added and them weld it all together. and does anyone know any good aftermarket rear shocks my stock one is getting wore out. i would prefer one that is adjustable

crf100, on 15 June 2012 - 05:11 PM, said:

Yes or have an engineering shop do this for you. I do not know if they make them longer off the shelf. Google it and see what you come up with. You could try the Aussie lift if you are happy with 1/2 to 1" lift. You can have your old shock repaired. Talk to your motorcycle shop for more information on who can do it locally for you.

Edited by GEOF, 15 June 2012 - 08:53 PM.

alright thanks im gana look into the aussie lift and i want to make a upgrade on the back shock so im thinking about just getting a aftermarket one