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That's exactly what I would think is happening. I've never cut one up and examined it to that extent, but that would make sense.

I'm not saying that Kevlar, nylon, or carbon fiber stretch. I am saying that a timing belt stretches. I don't care what it's reinforced with, it stretches.

Agreed. The recommended interval is 80 or 100k so yeah, it was a little overdue. The belt looked suprisingly good for its age though.

I've never seen sprockets wear to any measurable degree. Not the toothed side anyway. Variable cam gears wear internally but that's a different story. The stretch I'm referring to is the overall length of the belt, not tooth wear. over the weekend, I replaced the timing belt in am old...

The automotive industry uses belt drive transmissions because they're cheap and light, causing less drag on underpowered engines. NOT because they are quieter. Have you ever heard anyone say 'gosh, my transmission sure is loud' ? No, and neither has an auto manufacturer. Timing belts are...

I've had some limited experience with rc belt drive and I was not impressed. The belt drive on the xmaxx is very poor, IMHO. I am curious though, if a centrifical belt drive system, similar to the ones used on atv's and side by sides would have a valid use on RC. Seems like a variable gear...