Tire review - Schwalbe Thunder Burt

 Last summer before butte, I found myself with two sets of mtb tires that were getting a little worn down and wanted something that was fast, light, and had fresh tread for the race. The racing ray/ralph combo was been pretty good all around on the hei hei but is a little on the heavy side (770g/tire for 29x2.35 super ground). Pirelli XC/RCs are light at 700g in a 2.4 but never really felt super fast and after a spring of use the grip had fallen off significantly despite the tread wear still looking fairly ok (this is common with XC tires though- the fresh, sharp edges on the little knobs do a lot of work). It also turned out the pirellis test slow on bicycle rolling resistance. They looked cool I guess but yeah no sorry won't be buying those again.

So, deferring to the bicycle rolling resistance charts I went with the fastest tire they've tested- the schwalbe thunder burt

I'd always been curious about riding tires like this full time but was a little cautious. The kenda sabers are super light and fast and flimsy but only come out on special occasions, where these I was going to ride all the time on the hardtail plus at butte on the hei hei.

In 29x.2.25, super ground casing (there's also a lighter super race, which according to brr is slower) they came in at about 630g and measured a little on the small side with my 29mm internal width rims. I want to say 2.2 or so. Skinny and not much to them but the larger size was out of stock. With these on that loose sandy butte course, especially in the first half, I was a little all over the place but on a more normal trail and hardpack dirt they're fine. And they went fast and made it through the race. I didn't weigh my bike but with 630g tires and 1200g wheels, I'm guessing well into the 24s.

With that first set getting pretty worn I recently bought another set because I couldn't come up with a better option. This time n 2.35. They measure true to size on the same wheels and came in at 700g each. Been riding them at 19/20 psi f/r and they give a nice good cushy feel.

Mainly though, these tires roll really, really, really fast. They feel as fast as a good road tire going across town on the pavement and the bike just flies uphill out on the trails. Plus, for conditions where these would be a challenge I have the hei hei with more aggressive tires. My best description of traction on these is "better than you'd expect."

Is this a good all around tire for general mtb riding? no. But if you want to go fast, this is the one. The main downside is that they are expensive for a pretty limited condition, flimsy tire, but all the tires are getting fairly expensive these days.