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Just thought I'd post an update after a few more days' use.
I put the 145mm cranks on and they suit me much better for my usual route - I think it's just too rough and hilly for the 125s, at least until I get MUCH more used to them on the flat first. I also changed the brake blocks (cheap ones that came with the BMX brake) for some decent Aztec ones and the braking is now extremely smooth and controllable, meaning I can ride faster down steep hills without the feeling of losing control.
The lighter weight of the wheel is very noticeable, making the unicycle feel much easier to ride and balance, especially on the rougher parts of the route.
An unexpected bonus is that I really like the reduced Q of the standard width hub. I had a super-wide hub in my old wheel and was a bit concerned it might end up too flexy with a normal one, but I wanted to use ISIS cranks so it had to be a normal hub. I know a few people who ride normal width hubs with no problems, so decided to go for it. Wheel flex is no more than my old tank-like wheel, and the narrower Q feels really nice to ride (it's actually even narrower than my muni because I'm using QuAx straight cranks). I didn't think I'd notice the difference (it's only an inch narrower after all, and I'm quite tall), but I'm sure it feels better.
So, overall I think it was a very worthwhile upgrade. I'm still no sprinter on a coker (although my top speed has been up about 1mph to 16mph on the new wheel), but my actual average speeds and journey times have improved noticeably. Now to find somewhere flat to get used to those 125s...
Rob
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