The Z2's are approximately 430mm a-c.
I'm ok with their performance but if I can get better as well as lighter I've got no problem going modern- if it keeps me somewhere in the game it's got to be the way to go. A set of forks with the ability to run Vee's and at a later date disks would be a plus.
One thing I don't understand about putting spacers in modern forks, doesn't that just reduce the internal travel but keep the overly long external length of modern forks- which is going to throw out my geometry?
Ultimately I am looking for lighter forks, performance at least equal to my z2's but without throwing away the handling of the bike. Is it possible?
The Z2s are probably the best 20th century forks but you can do a lot better!
Rock Shox Rebas are brilliant forks, not quite as light as SIDS but MUCH stiffer. They go where you point them! Magura Durins are excellent too but not as user serviceable as Rebas. Both were available with canti studs and all have disc mounts. There are loads of Rebas around and all can be shortened to 80mm or even 70, 60 etc.
Spacers don't just shorten the travel; it's tricky to explain but I'' try...
The air piston travels up and down the inside of the stanchion, compressing air at the top and itself being forced down by air pressure. To stop it blowing straight out of the bottom there is a circlip at the botto,m of the stanchion. Under full extension, the piston shaft buts up against the circlip and can't go lower. The travel reduction spacer is fitted between the circlip and piston assembly , stopping the fork extending quite so much and effectively reducing the travel, reducing a-c height and keeping your bike handling sweetly!
Rock Shox are really user friendly,with guides and videos of just about everything on the SRAM website, and all the parts you'll ever need available to buy.
Avoid Fox though- they're shit.
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