Giant Fast Road Sizing Chart


Table title

SizeRider Height (cm)
XS155 - 165
S160 - 170
M170 - 180
L175 - 185

The charts show our recommended sizes based on height, but there are some other factors, like arm and leg length, that determine a great fit. That’s why you’ll see some overlap in our recommendations. Not every rider who’s 170cm, for example, will fit on the same size bike. The best way to find your perfect fit is to consult the experts at your local Trek retailer.