On SOMA Xpress: I started using them upon recommendations from this group on a 650B winter tire that was 38mm or less. I wound up really liking them generally and they were reasonable for light snow on city roads. (I did, though, rip a sidewall by incorrectly positioning my White ENO eccentric hub/rear brake shoe. Ya learn that once! Gotta love those QB's for that very reason. But when I set up my proto bleriot frame as a single, there wasn't any small QB's like they had in the last silver run.) -RCW
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