A friend of mine recently purchased a Scott SUB bike (quite cool I must say for the price) and has ended up with 2 flats in about 6 weeks. He knows nothing about bikes so I offered to fix his last flat.
He is running a set of 700 X 32C slicks on a 28mm deep Scott AERO style rim. As soon as I pulled the tube I noticed a small issue. In order to have the right amount of stem coming thru the rim, he needs at least a 48mm Presta stem. I can't find any tubes that are a fit for a 32C that have a valve stem longer that 36mm.
It looks like the bike shop that fixed his first flat a few weeks ago put a 20-28C tube in with a 48mm stem. So at 32C the tube was running thin and over inflated. I'm in NYC and called 10 bike shops yesterday and know one had a appropriate tube. I too fixed his flat for the time being with at 20-28C/48mm stem.
Don't Cyclocross riders have the potential to need a tube like this? (AKA, wider but with a longer stem)
I am getting the feeling that he is getting flats because he is riding on thin/over inflated tubes.
Any suggestions? I am thinking he might just want to drop to a 28C tire and dump the 32C's. I just know he didn't really want to put more money in the bike if he didn't have to.
Thanks in advance for any good suggestions.