really schwalbe?

The Northern Monkey

it will probably be marketed as #enduro

The Rookie

I almost put Enduro, I guess if you pump up the outer for the pedally bits and then deflate for the downhills they would make sense, you wouldn't really want to be at the very low pressures for pedally bits!

jimothy78

The Rookie wrote:

you wouldn't really want to be at the very low pressures for pedally bits!

Interestingly, I read in a magazine (forget which) article on XC racing that some of those guys use ultra-low tyre pressures (IIRC, mid-teens psi was mentioned) because the tyres then roll more smoothly over small surface bumps and actually work out as more efficient overall compared with higher pressures. I was sceptical at the time, but would be interested if anyone knew of any data on this effect. No doubt it all comes down to personal preference, though - could be almost as long-running as the wheel-size debate

robertpb

Once you get down to about 18psi even with lightweights like me the roll on the rim in corners throws the handling all over the place on the back end, front is OK.

rockmonkeysc

It wouldn't be ideal for downhill either because the heavy, sharp impacts will just destroy wheels at those pressures and the tyre will be rolling off the sides of the rims during hard cornering.

njee20

The Rookie wrote:

I almost put Enduro, I guess if you pump up the outer for the pedally bits and then deflate for the downhills they would make sense, you wouldn't really want to be at the very low pressures for pedally bits!

As Jimothy says, softer tyres roll faster on rough ground. I run 20-25 psi at most, and less if it's wet.

It wouldn't be ideal for downhill either because the heavy, sharp impacts will just destroy wheels at those pressures and the tyre will be rolling off the sides of the rims during hard cornering.

Dunno, it'll enable you to go lower without risk of pinch flat. In the event of a truly massive square edged impact you may trash the rim, but that's quite a leap, and you're not gonna manage to roll the tyre off because of the secondary tyre. As that's the intended use case one assumes they've thought of these sorts of things...

rockmonkeysc

njee20 wrote:

It wouldn't be ideal for downhill either because the heavy, sharp impacts will just destroy wheels at those pressures and the tyre will be rolling off the sides of the rims during hard cornering.

Dunno, it'll enable you to go lower without risk of pinch flat. In the event of a truly massive square edged impact you may trash the rim, but that's quite a leap, and you're not gonna manage to roll the tyre off because of the secondary tyre. As that's the intended use case one assumes they've thought of these sorts of things...

It won't roll off the tyre but it will deform enough that it will be squirming around.
Square edge hits are everywhere in downhill tracks. A lot of downhill tracks involve jumps in to rock gardens as well. I was racing most weekends in 2013 and got through 7 rims, all badly dented, running 28psi with dual ply tyres and Mavic 823 rims.
Pinch flats are rarely a problem with dual/triple ply tyres.

njee20

I know, it was the 'truly massive' bit that was relevant. I don't think they're thinking it'll be suitable for manicured tarmac only... It's desgined to save your rims by adding some extra cushioning.