Originally Posted by yohannrjm

Hey Guy,
You should be able to go to 21-22 mm tires. Just make sure that the tire sits well in the rim and makes contact all the way when it is fully inflated.

I use tubulars on the road occasionally. There are a few disadvantages with that, though.

1) You'll have to carry a pre-glued spare tire, in the event of any flats. If you do have a flat and have to use your spare then:
a) You have to pray that you don't flat again (or carry two spares).

b) You have to corner gingerly since the replacement will not be stuck well.

2) You can carry a patch kit, but that involves removing the tire, base tape and stitching; then patching the tube, and then reversing the process, followed by sticking the base tape and tire back on. It can be done.

3) Cheap tubulars tend to be not be round enough or straight enough. Good tubulars can cost a LOT of money.

4) You can run them at very high pressures, but you probably will not want to do that when just riding around.

5) Gluing tubulars is easy, but some people do not like to do it.

That said, I like them.