Hmm, I found my UN pitch gauge and the RRC studs could be UNF. It looks like 18tpi. I'll have to pull the wheel off the carrier to check properly.
Late edit:
I've pulled the wheel off the carrier and one stud is 16mm. I'm sure it's metric. The 18 tpi thread gauge nearly fits. I can't find my metric pitch gauge. I could use a metric rule.
The other two studs are a smaller diameter and are 13tpi Unified Thread. Looks like Kaymar didn't want to spend the money on LR studs



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