I'm planing to switch to a disc on the rear and I was wondering which rim I should go for. Standard 32 hole rim or 36? Does it make much of a difference having 4 more spokes? I don't know how much it would increase the stiffness of the wheel. If 36 is the better choice, I'd get a tryall 47mm, as the new ECHO rims are not available with 36 holes... btw, what do you think about this disc tap, compared to others you've seen? It's on the MBK T1000 frame. And which disc would you go for? I'd say the hope mono trial 180mm is fine. But what about the Hope mono m4? It has a four piston caliper, whereas the trial has only 2. But from the looks the pistons on the mono trial seem to be bigger, meaning more power? The only negative thing about the mono trial is that it's limited to a 180mm rotor. The mono m4 also comes with a 200mm caliper. So which one is stronger? Mono m4: 4 pistons + 200mm rotor or mono trial: 2 larger (?) pistons + 180mm rotor?