• I'm with spotter, if a 43mm tyre doesn't fit in the front at 584, 590 would be even tighter. 26" isn't a reason not to build it up imo.

  • I thought 650bx47 was equivalent in outer diameter to 700cx30? I should clarify the tyres in the picture were 700c.

    But ye looking at a few speedway bikes/frames it does look like 26" was more common.

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