The bontragers are available. The weigh 500gs. I weighed three and they're all minimally off, (like 6 g's.) They are very light, though they are smaller, what I would term, race specific tires. They'll be fast on the right course, but choose carefully. The size is also very close to what is on the tires. This mounted on a road rim for comparison. Measured about 46x46mm on my caliper.
Ben, how would you compare tread depth between the XR fatties and skinnies?
I'd love to see someone do roll-off-hill tests to see if there is a speed difference. IMO too often people associate small with fast, and wide with slow, while my experience tells me the fastest rolling MTB's were the ones I tried with 2.35"+ tires.
But really, how low before we get pics and specs of the Karma's? People have been riding them for some time already! I need a pair! I'm set on trying one as my main front tire for the coming summer season. Rear would be the NoTubes Vel-Crow...
The difference isn't really in the tread depth, that's about the same. The difference is in the number and the spacing of the knobs. The 1.8's have far smaller knobs and they are spaced wider. They should roll faster, admittedly without the cushion or full cornering ability of their big brothers. I can't really do an accurate ride test now, there's about 5 inches of wet heavy snow outside. Can't ride the good bikes, (salt on the streets,) can't ski.
Sorry for the less than perfect pics, figured they were better than nothing. There are the same number of knobs on both tires, at least the tread pattern is very similar, just downsized. The knobs are about 30% smaller, and slightly wider spaced, on the 1.8's.
Then how do some people seem to have gotten them through normal channels already? Just samples?
Looks like I'll have to save up for a pair of Karma, or maybe 2 pairs. Stan's Vel-Crow is now expected "early spring". I hope the Karma will be somewhat based on the specs Stan asked for his own tires, so the Karma can be used tubeless too. For my 8.2kg project bike I want the ultimate in speed and grip!
Karma front, Vel-Crow rear, that is gonna have to be the ultimate lame-course combo!
I can't wait till I feel (claim to feel) the snappy acceleration of a 29"er on race wheels with proper race tires that can compete with any 26" bike on tire weight and performance!
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