Personally I ride 120 as there is almost be weight penalty. You can lock it out and ride rigid. But you can also descend quite a lot better than 100. But then again, I prefer to ride 140 as it's a lot better than 120. And so it does on. But for my XC bike I have 120.
But unless you riding real MTB terrain, 100 is fine, if a bit slower sometimes.
Personally I ride 120 as there is almost be weight penalty. You can lock it out and ride rigid. But you can also descend quite a lot better than 100. But then again, I prefer to ride 140 as it's a lot better than 120. And so it does on. But for my XC bike I have 120.
But unless you riding real MTB terrain, 100 is fine, if a bit slower sometimes.