Update On Carbon Rigid Fork Testing
October 26th, 2006 by Guitar TedThe One One Carbon Superlight fork and the Bontrager Switchblade Race X Lite fork are still getting ridden and I wanted to give my update on what’s been going on.
First off, the On One fork has been back on the On One Inbred 29″er and it’s obviously a great match up. The thing about these forks is that they have a 47mm offset, and that is not going to be a great match up for some bikes in some types of terrain. With the On One fork/ bike combo however, it’s a great riding set up. I wanted to see if the fork had any tendencies for lateral flex in off camber situations and in high compression, “g-out” type cornering. I’m glad to report that it didn’t exhibit anything of the sort. It steered precisely and still gave me the nicer ride quality over that of the originally equipped Superlight steel fork.
One thing that may or may not be an issue for certain brake set ups on the Carbon Superlight is rotor clearance. The rotor on my Avid BB-7 is tight, but it clears. Perhaps there is a rotor/caliper/hub combo out there that might be a problem. Just a paranoid thought perhaps, but the clearance doesn’t leave much wiggle room.
The Bontrager Switchblade Race X Lite has made it over to my Karate Monkey single speed. The Karate Monkey was designed with the 38mm offset suspension forks in mind, so the match up has been a good one. The Switchblade mimics a slightly sagged out 80mm suspension fork with it’s 465mm axle to crown measurement. That has steepened the head angle of the Monkey ever so slightly, as the Monkey’s axle to crown height with the original steel fork was 470mm. This has had the effect of giving the Monkey a very slight difference in handling. I can discern a bit of a different feel in steering, a bit happier to carve a tighter arc perhaps. Also, it seems a little more reluctant to loft the front wheel when I want. There was a slight increase in handle bar height with the Switchblade, and of course, the steeper head angle is going to put a bit more weight on the front end, but just a bit.
Overall, I’d say the Karate Monkey/ Switchblade pairing is far better than the On One/ Switchblade set up. The handling on the Monkey is still well within the parameters of what it was with it’s original steel fork, but I lost a bunch of weight, and gained a smoother ride. The braking, steering precision, and lateral stiffness are all on par with the original fork. Conversely, the On One never really got on as well with this fork for my riding style and terrain. I can imagine the On One/ Switchblade set up being okay for fast fire road, or wide open, sweeping curved trails. But for the tight, techy single track I ride, it wasn’t an ideal set up.
It seems more apparent as the testing goes on that both forks are really nice, you just need to be careful what you put them on! More to come!







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A look at the KM geometry chart suggest a head angle of 71 to 72degs with a 43mm offset. 468mm long fork. It’s here - http://www.surlybikes.com/karatemonkey.html
brant: I measured mine in the shop the other day and it came out to be slightly steeper than 72 degrees with the Switchblade fork/ Bonty XR tire combo.
Ted, what hub are you using? There are a few known to put the rotor closer to the dropout.
Shiggy: I am currently on a Surly New Disc Hub. The special purple set they put out. I’m going to try a different wheelset soon to test out this very theory.
So long as it misses, it’s no problem.
Can you use the Pace bolt-on cantilever mounts on the Bontrager fork?
Chad: I’ll put that question to my contact at Bontrager for an answer. Obviously, the Pace fork leg outside diameter would have to be identical to the Switchblade’s to be compatible, first off.
Cool, thanks GT.
Chad; Update from my contact at Bontrager: The fork hasn’t been tested with these canti adapters, so the inherently different stresses that would be introduced cannot be commented on. Bontrager therefore recommends that you stick to disc brakes only for the Switchblade forks.
On my WTB laserlite hubs/Hope Mono Mini the rotor just barely cleared the dropout, on friend’s ChrisKing/Avid BB7 combo there was very very slight rub under some riding conditions.
There is also a reses on the inside of the dropouts, the cutout isperfectly sized to 3/8″ washer, that is