>>1767598ya I had trouble with the pump head that came with the Giant control tower,
the rubber grommet could not get a good grip on presta valves, it got shredded So I put the pump head from a Serfas TCPG on there, still have kind of the same problem but the pre-load adjustment is better
zefal husky came with a weird fully metal "Z twin head", kind of glitchy, swapped out for a FP65 Z-Switch pump head
some of the Manually Switchable pump heads are quite good, although the levers do not have as much clamping force they are much easier to fit onto smaller tires
otherwise for getting around such problems Presta to schrader and 90 degree adapters are handy
