Quote:
Originally Posted by MFAFF
I'd suggest that with those rims a 25/26mm tire is the widest that will work on it. Anything wider, regardless of whether or not it fits the frame and fork is oakley to roll off the rim when you turn in, especially going fast downhill..... possibly to be avoided.
The rim is likely to be 17mm wide and so check with the tire makers what they reckon. I know my Mavic M40 rims from that era are really not suitable for anything more than 26mm... and the ride on them is better than the 23s but nothing like a 28 or 30mm.
That being said a set of modern rim braked wheels, either alloy or carbon will be wider (19mm) and so suitable for 25 and upwards to at least a 30mm tire. There are a number of (relatively) inexpensive 50mm carbon aero rims that are designed around 28mm tires. Worth it for the additional speed even with an older frame.
I found the aero rims allow a 2-3 km/h average speed increase over a 199 km ride with the same effort.. or maintaining the previous speed with less effort. Much appreciated.
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I am a huge fan of deep dish wheels. When they were available to the public way back, it was alum. A bike shop owner said, try these, and handed his personal set over to me. I was told I can ride one tooth smaller on the rear cog with them using the same effort. I was in pretty good shape then. rode a lot so I went on my regular route. What a difference. I went back the next day, ordered a set. They make a HUGE difference. I think one mph can be had but the trick is the speed must be over 17 mph or so in order for them to be effective. The modern dish wheels are so light that they beat out any of the old school high spoke count wheels plus the aero benefit, they are superior wheels. Dont forget, they are tough and durable also.