Hi All,

I have a mountain bike that has a Rock Shox SID fork and thinking about upgrading it.

Would any type/brand of single crown fork fit my bike? I want something with longer travel.

What year is your bike and fork? I ask because some older ones had 1" steerer tubes (what your stem clamps to), and newer ones have 1-1/8".

Assuming 1-1/8", the answer is yes, just about all would fit. You say you more travel -- don't go for too much more, 25-30mm more is about all you can safely do; more will mess up your bike's handling/steering.

Rock Shox can easily fill your needs once again. The Reba or Pike will work, just look for the "U-Turn" feature, you can turn a knob to the travel that suits you.

Manitou would also work, and I can say, I like the smooth action of Manitou forks. They've unfortunately discontinued the bigger forks I'd be interested in, so I no longer look at them myself. (My KINGDOM for a Travis SC....)

I've never used Marzocchi, but they have the rep of being just about bulletproof.

Fox currently "rules the roost", the most popular, and they can also help you out.

Could be tapered too. Although you could always put a reducer in there and still use a 1-1/8. Just don't buy something bigger than the headtube (1.5 or tapered if it's 1-1/8, for example).

A fork with a longer axle to crown measurement will slacken your bike out. So it'll be more stable on downhills, but not as good of a climber and slower to turn. Which could be fine if you only ride ascents to get to descents...I put a longer fork on one of my bikes and now it descends like awesome-sauce. Like DX said, you can go with a little more travel, but don't try to put a 160mm fork on there...it'll stress the headtube and mess up the steering. Also keep in mind that pretty much anything you put on will be heavier than a SID, so the balance of the bike will change to be a little more front heavy.

If you have a SID, you would probably be better off getting a different type of bike, if you want longer travel. Upgrading from a SID will be hard, as this is th otop of the range model from Rock Shox and is compariable with the high end offerings from other manufactures like Fox and Marzocchi, only BOS forks would be a major upgrade, but at a massive cost.

The max travel a SID has had is 120mm, and that is on the 32mm stanchions version. If you want more travel than this, your frame was most likley not designed for it, and you would be better to look at a new bike, or at least frame in addition to the forks.

Other factors when looking at forks also have to be considered, as both DX-MAN &Zepher11 have noted, including steerer tube, tapered headset. Knowing what you currently have, (fork and frame) would help a lot for suggestions

True if it is a recent SID (year 2006 or later). But it also could be a much older SID (from around year 2000), in which case a better fork could be easy to find (one option could be a current version of SID fork).

Thanks for all the response. I bought my bike in Nov 2003.