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I know this is an old thread, but I just bought a new belt for my Jonway 150. After reading this thread last summer, I thought that maybe I should change mine out at seasons end. Belt has right at 4800 miles on it, Gates Premium 835 20 30 (PL30705). Ordered another just like it.
Removed the old belt, cleaned it up, flipped it inside out to inspect....and found no cracking what so ever. Belt looks good, and measured 18.08mm across the top. (I read somewhere the wear limit is 17mm) So I'm thinking my belt is 2/3 used up, I've worn off about 2mm.
Now here is what surprised me....the brand new belt measures 19.20mm (taken at 4 different locations around the belt), so actually I've only worn off 1.12mm, in 4800 miles. So it looks like I'd be safe running the old one another season, which for me, is 2000 or so miles. I'm really not a cheap bastard.....just hate to throw something out prematurely.
Have any of you measured the width of a new belt? This 19.2 figure really threw me...that's not even close to the stated 20mm. If the length was off by the same 4%, it would only be 802mm.
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