Don't know about this site but there are several comments that come up if you google Andrews 30 tooth causing belt brakage. I'm not saying if this is true or not, but below is one post from another fourm that takls about a possible issue with the Andrews pulley, it from 09, so this may have been changed now.
We compared the original pulley with the Andrews 30 tooth steel pulley that was used in both cases of premature belt breakage. The immediate observation was that the contact patches on each tooth were much smaller compared to the original part. We measured the tooth width and found the Andrews one to be about 2/10" smaller. On closer inspection we could see rub marks at the bottom of the teeth that extended to the bottom of the grooves. This indicates a relative movement of some sort that should not be there. The original HD belt with 5000 miles on it shows is micro-fractured on in the inside showing countless hairline fractures. I will post some pictures in a few days.
IMHO the pulley's geometry is off and the combination of a heavy bike, increased torque and the smaller diameter pulley with dimensional problems kills the modern fiber reinforced belts. I will not put an Andrews 30 tooth belt on any bike anymore after this experience.
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Topic: 30 Tooth Conversion----What's the deal with Belts Breaking????? (Read 16164 times)