Presta
- Lower weight
- Needs no cap
- Built for higher pressures
- Will not clog with mud
- Skinny and Light
Schrader
- Heavy
- Fills with mud
- can leak air
- needs no adapter for old pumps or filling station pump
- Fat and Heavy
Basically we would always run a Presta valve if given a chance. On a road bike it really is the only game in town. On a Mt. bike it is more common on bikes above $500.
