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38s - I only have about 400k on these so not sure - def no gashes/lacerations. expect I've had a number of micropunctures that have sealed without my knowledge
32s - I put about 4000k on a set and they went through the usual cycle of puncturing / sealing that you'd expect for tyres ridden on canal paths, cycle paths, windfarms etc. I didn't get any large gashes though. the one issue I had with them was that they punctured once and did not seal - not an issue because I was literally a mile from home so just pumped them and rode on the slow puncture. could have just put a tube in if I was further from home. refreshed sealant, pumped them up to 60PSI and that sealed them. I used these on (slow) winter club training rides and light off-road / touring - perfect use case imo
I'll stick up for GKs
I've run 32s (tubeless) and 38s (tubeless) with little to no issues