I would err on the side of getting one too big than too small! I have a medium sized seat bag on my path bike but got aggravated when I couldn't fit my cell phone, keys, and garage remote in it the other day. It also depends on what type riding you are going to do. If it is strictly going for a ride only then a medium sized bag might do. If you are going to be commuting or running errands around town then a bigger bag might be needed. Definitely bigger is better but check clearance over your back wheel also.



Reply With Quote
