Thing is, to make my 700x50's as fast as 700x23's I need to air the 700x50's up to the same harsh ride. I can never get the 700x23's as comfortable though as I would pinch flat. Take into account that tiny tires usually go with tiny wheels and spin weight does make a difference.
My opinion is that 700x25's are probably faster at x weight bike rider than 700x23 but 700x28's are not faster until weight is increased. If I weigh 75lbs 700x23's are probably faster .. Lighter. More aero etc. Not until we add weight and side wall flex will larger tires be faster. Then again if I save 15 minutes over a 25 mile ride have I really lost anything? Touring and tires and bikes and we still want to talk weight and speed. I don't get it. I do but I keep reminding myself that it's not a race. Only place I lose speed is all out efforts casual rides i se e no difference. Sent from my iPhone On Feb 25, 2011, at 12:14 PM, Montclair BobbyB <montclairbob...@gmail.com> wrote: > William you're too funny... I'll make an unscientific guess that > you'll be ever so slightly faster on the 700 skinnies, but not nearly > enough to offset the comfort and stylishness of the Hetres. Please > post pictures of both... > > BB > > On Feb 25, 1:04 pm, William <tapebu...@gmail.com> wrote: >> OK so I made a sort of self-indulgent mod to my A. Homer Hilsen. I >> set up the normally 650B bike with a 700C wheelset and short reach >> brakes. It's a wheelset I already had, and a short-reach brakeset I >> already had. So now I have a single bike that can easily be taken on >> a ride with 650Bx(whatever) tires one day, and taken on the same ride >> with 700x(23-28) tires the next, or whatever. >> >> I bought the bike because of the feel of 650B, and I'm thrilled with >> it. Like most of you, I've been skeptical of the claims from Jan H >> and others that fat tires are faster. That said, on brevets in the >> last couple of months, I've been surprised at how quickly I catch and >> pass riders on coasting descents when I'm on 650x38 at 50psi and they >> are on 700x23 and I presume 90-110psi. That's anecdotal, and doesn't >> necessarily mean anything, but it was surprising. >> >> So, now I think it will be fun to do a pseudo-scientific spot >> comparison between 650B and 700C. My commute to work is a 35-mile >> hilly ride through the east bay hills from El Cerrito to South >> Hayward. A good chunk of that is a non-stop stretch. I can usually >> get from my front door to a traffic signal in front of Castro Valley >> High School without stopping or putting my foot down. The next 10 >> times I do this commute, I'm going to alternate between the two >> wheelsets, and record my time for the same non-stop stretch for these >> ten rides. The 650B tires will be hetres at 50/45psi, and the 700C >> tires will be continental gatorskin 28s at 85/80psi. >> >> Anyone care to guess which will seem faster? Too close to call? >> Impossible to test unless the rider is blind to the wheel >> configuration? Any advice on keeping the data clean? > > -- > You received this message because you are subscribed to the Google Groups > "RBW Owners Bunch" group. > To post to this group, send email to rbw-owners-bunch@googlegroups.com. > To unsubscribe from this group, send email to > rbw-owners-bunch+unsubscr...@googlegroups.com. > For more options, visit this group at > http://groups.google.com/group/rbw-owners-bunch?hl=en. > -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. To post to this group, send email to rbw-owners-bunch@googlegroups.com. To unsubscribe from this group, send email to rbw-owners-bunch+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en.
