I have a Specialized Sirrus...basic model - It has 700x28c wheels/tyres.
(Wheels are Alexrims DA16 - tyres are Nimbus EX)
Can I put a 23c or less (23mm or less?) tyre straight on there, or do I have to change the wheels first?
Cheers! Don't want to look stupid at the LBS, don't mind it here!
p.s. I'm 100kg - too much weight for so smal a tyre?