I use GB 650x50 with 42c tires. It’s tight but I made it to work without even slight rubbing.
I was wondering about the 26" ones as they're possibly a bit cheaper and seems some people have had success with the 650b×47mm and 26"×60mm guard combo
@frankenbike started
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I use GB 650x50 with 42c tires. It’s tight but I made it to work without even slight rubbing.