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Increasing Fork length 10-20mm on Scott Spark 40

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Increasing Fork length 10-20mm on Scott Spark 40

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flag Cjmc
Posted: Jul 31, 2013 at 11:33 Quote
Folks

I have a heavily component upgraded Scott Spark 40 and I'd appreciate any input into my plans to change my Rock Shox Reba RL fork 120mm twin lock out to a Fox 32 float RL 130mm or a DT Swiss XMM 140mm. I use the bike for XC 40% / Trail 40% / AM 20%!

I was considering buying a Scott Genius LT 30 but I love the lightness of the spark. I don't seem to have the confidence with the short travel on some of the trickier and steeper sections of trails / mountains and was thinking an easy solution might be to increase slight the travel.

I'm aware of the issues this might cause to the set up and dynamics of the bike but I have an adjustable bottom bracket that can partially compensate this and I plan to get a shorter stem (60-80mm from current 110m) as well as a wider riser bar (680mm to 710mm and 15 degrees to 30 degrees)!

Does any know if this will work ok. I don't plan to change rear shock. Geometry for the bike is as attached

Many thanks in advance
Chris
flag Cjmc
Posted: Jul 31, 2013 at 11:34 Quote
Couldn't figure out how to add geometry. It's a size large in attached link

http://www.scott-sports.com/us/en/products/221693/
flag seric
Posted: Jul 31, 2013 at 20:08 Quote
I recently changed my RS Tora 302 (130 mm) to a RS Sektor Air (150 mm). I was concerned it would raise my front end too much, but so far I am liking the longer shock at 150. I didn't make any other changes to compensate. I have a spacer I can add if I want to shorten the travel, but for now I'm sticking with long. Also, it may be worth comparing the axle to crown lengths of your shocks to get a better idea of how much longer each really is. There's a useful reference folder in this forum.
flag Cackerman
Posted: Jul 31, 2013 at 21:23 Quote
I think 20mm is a safe range. Many frame manufactures list the range of their forks with a 20mm range, with the low end being the fork the bike was originally built with. So from a frame stress point of view, I think you would have nothing to worry about.

Geometry will be slackened by a degree and the BB will come up a tiny bit.
flag Cjmc
Posted: Aug 1, 2013 at 11:00 Quote
Cheers for answers. Do you think the 10mm increase is worth it? I'm not sure my Scott Twinlock will work with the fox fork and I'm not even sure the fox fork will be an upgrade over the Reba RL's.

I also think the original scott spark frame was designed for 100mm travel and the recent ones incorporated 120mm. Scott says it will invalidate the warranty. Not as concerned at that but more focused own whether its a worthwhile venture. Alternatively I could sell the spark and buy a Cube 650b stereo with 160mm travel and little difference on weight...
flag Cackerman
Posted: Aug 1, 2013 at 12:55 Quote
If your frame was designed for a 100mm fork and you already upgraded to a 120mm, I would recommend not to go up more. If going up another bit puts you into the “voided warranty” zone, definitely not.

There is a guy here that bought my Anthem frame (80mm rear travel, designed for a 80mm to 100mm fork). He has slapped a 150mm fork on and built it up as an AM bike. The thing almost qualifies as a chopper. I like to look at the picture when I have the sads—it always gives me a chortle.

If you are ridding stuff that requires a bigger travel fork, I strongly recommend getting the proper frame to match.
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