Quote:
Originally Posted by Andrew Lawrence
The actual 15mm pulley is toleranced a bit larger than 15mm to be able to hold two 9mm belts if needed.
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To expand on this, the 15mm pulley has 17mm of space for a belt. This may not seem like enough, but RC from WCP has told me that the VexPro belts are actually 8.5mm instead of 9mm, allowing a perfect fit for two of the "9mm" belts. Useful information for anyone trying to save space and use belts in series with each other.