I have both a road morph and a mini-morph... They are pretty much the same pump except that the mini is about an inch shorter and it doesn't have a built in gauge. I keep the road morph on my commuter which has slightly more clearance between the front tire and the down tube (due to a 24" front tire) than my road bike which is 650's. Both bikes are 19" Terry's (~ 48cm)The mini morph fits on the underside of my downtube on my road bike as you can see in this version of my avatar:



Both pumps will easily get a tire up to pressure...even a 23mm 650!