Will these fit 126mm rear and can I fit single speed?
My frame is 126mm and I have HOPE QR.
Also need to fit 37mm 700c tyres - thx
These are road bike 700x25c wheels designed for Shimano or Campag cassettes, not single speed. You can buy conversion kits to put a single cassette onto wheels designed for 10 speed cassettes, but if buying new, better to go for a proper singlespeed wheelset with aflip-flop hub
Won't fit 37mm tyres either -dangerous to try, they are likely to pop off the rim.