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London Fixed Gear and Single-Speed is a community of fixed gear and single-speed cyclists.
@branwen
I'd think they are pretty similar to the GP4000s. Based on riding 4seasons I would say that these are more supple, but possibly less puncture resistant. That said I ran a front one most of last summer and all through the winter and only had 1 puncture on it. Getting a bit cut up now and have swapped out for a new one, but will glue it up and use it again next winter!