I have a specialized s-works HT with SIDS at the moment. The SIDS are buggered and need replacing but i am thinking about replacing them with a slightly sturdier, 100mm such as a pair of rebas. Would this make a difference to the handling of the bike? (it does suggest using 80-100mm forks with the frame.)

cheers

be fine, get the 100m dual airs and enjoy a 10x's improvement to your bike.

( and 1lb heavier )

can internally adjust to 115 or 85mm's aswell if need be, there short for there travel, but don't know compared to SID's.

My wife's M4 Stumpy rides better with a 100mm fork IMO. You'll probably notice the lack of flex more than the extra length if you get rid of the SIDs.

I think any fork would give a noticeable improvement over the SIDs to be honest. I had a set of 04 world cup blackbox things and they were by far and away the worst forks I have ever used.

Get rid of the SIDs and get the Rebas, they're a brilliant fork. You'll probably be able to go 10 times faster too because you'll have some proper suspension underneath you! ;)