Hey there!
I’m going to build a light 27.5" unicycle, so would like to buy a carbon rim.
I mostly ride XC, sometimes very light DH, no big jumps and drops. My weight is 75kg. The tire I’m going to use - Duro Crux. But maybe sometimes something more narrow for DH - up to 2.5-2.6". The running pressure will be relatively low for the better damping and traction, most probably will ride with TPU tube.
I am considering a choice between Nextie and Light Bicycle rims:
Nextie - NXT27XM46
LB - AM740/EN740
(or maybe you can recommend something else?)
Both are 40mm internal width (BTW, is this width a good choice for my requirements?), and both will cost me the same, but there are some differences:
- Nextie is 445g - sounds great, LB is heavier - 480g for AM version and 530g for EN version.
- LB has an asymmetric profile, Nextie does not.
Which rim would you choose?
And one more question - which spokes?
Thanks!
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So you think AM740 is not sturdy enough? What is you weight and riding style?
Nextie is a bit cheaper to buy in my country. It costs $240 incl shipping, LB costs $255
I built my muni with the RM29C15 rim from Light Bicycle. It’s a 45mm internal width and I run a 29x3.0 Bontrager XR2 tire on it. It’s a great rim. It built so easily, essentially no truing required.
I spent a lot of time consulting rim tire width compatibility charts before I chose my rim. 3.0"+ is almost always going be recommended to be on a 40mm or wider rim. 3.25" should probably be on a 45mm rim. I think it probably doesn’t matter as much on unicycles as it does bikes because we rarely get as leaned over and on the side knobs of a tire like a bike can. Therefore the ideal tire “roundness” probably isn’t as important. I would probably air on the side of running a wider rim with a more “squared off” tire profile because that will better support the sidewalls of the tire and reduce folding, which we do get when side hopping on a unicycle.
That said, a 2.6 is going to be awfully square on a 45mm rim. A properly sized rim for a 2.6 is going to be too narrow for a 3.25, and vice versa. I chose to go with a middle ground size with the 40mm/3.0 combo and I don’t feel the need to go larger or smaller on the tire.
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