Just got the 140mm KH Splined Cranks, put them on the KH24 and hit the trail. I found it to be a lot more fun ripping down the trail, up wasn’t so bad I still walk in the same places as with the 170’s. I do have brakes so I don’t loose any control on the downhill.
Yes, the 24x3 is boring on flat, easy trails. It feels like your not getting anywhere at all. I try to find twisty, rooty, rocky, technical trails to ride my 24x3 on. I also prefer it for urban/trials riding.
Having just started taking my 29er with 125mm cranks off road, I love it. Most of the trails close to home are way to easy for the 24x3 muni. The 29er is fast enough to make the boring trails fun and I get a good workout. I’ve added a v-brake, so down hills a no problem.
I’ll never get rid of my 24x3, but I do plan on riding the 29er on the easier trails. I’ve been commuting on it too, since my Coker wheel is taco’d.
On the subject of trying short cranks on the trails…
I was trying the 140mm montys from my trials Yuni on my 26" pashley. I went out to a trail I ride that is pretty technical. It turned out the combination of higher speed and lower control can be a problem. I ate it pretty bad on this one hill - usually a very fun and challenging hill.
When I landed, my left leg was jammed very very tight in between the crank and the tire. I could not pull my leg out. What’s worse is my leg was twisted around and it was hurting a lot. It’s one of those situations where your in so much pain and you have to get out, but you can’t think straight because your in so much pain. I had to lift the unicycle with my leg and rotate it around and then find a way to force my leg out. For a second it looked like I was going to have to let the air out of the tire to get my leg out. It hurt like hell and now I have an awesome bruise on the back of my leg where the crank was jammed.
So, yeah…the extra speed on the trails can be tricky.