Any disadvantages to 650c wheels

[TiMan]

Are there "real" disadvantages in performance seen with 650c wheels?

"They say" acceleration is better but ride is a little harsher.

What about performance seen "at speed" at any given power output etc.

Thanx

 

[Brizza]

I don't have any answers but I've asked the same questions myself.

The smaller wheel should be lighter and faster.

Brian

 

[patch70]

Apparently it is a toss up between:
Pros: Lighter, more aerodynamic.
Cons: Higher rolling resistance, you look like you are on a kiddie bike.
I don't think they give a big advantage or disadvantage overall as the pros & cons even eachother out.

 

[Brizza]

Tyres and tubes would be harder to find.
Wouldn't smaller wheels look right on a small frame?

Why would a smaller wheel have a higher rolling resistance?

Brian

 

[patch70]

Because to travel the same distance, the wheel has to turn more times, this leads to higher resistance in the hubs (I think). That is the theory.

Some suggest that 650's are okay if the rider's height is up to 173-178cm (5 foot 8 inches- 5' 10") only and that 700's are good for those 168 cm (5' 6") and above. The overlap is for overall bike fit and rider flexibility.

 

[Brizza]

I can understand that in a cheaper hub but on the smooth hubs it wouldn't be a problem. The increased speed of the rim could be a slight aero and weight disadvantage offset by the shorter/lighter weight.

Brian

 

[patch70]

That sounds like a better explanantion than the hub one.

 

[drewjc]

Although it is neglible with todays 11 tooth sprockets and cheaper aftermarket chainrings, but you may find that your gearing needs to be changed to keep up with the guys on bigger wheels. Not really a disadvantage as such, but a bit annoying.

 

[gclark8]

Several of my friends use 650 wheels. The bikes are custom made and offer less wind resistance. Highest gears seem to be 53/11. Some pix: http://www.trysport.com.au/frameset_athleteBikes.htm

Some wheels for sale: http://www.triwa.org.au/discus//messages/6/1582.html?1080873875

I hope this helps,

cheers
George