650 c wheels- what is the tradeoff?

[smilingcat]

there are several pros with 650C wheel on a smaller frame. frame geometry doesn't have to be compromised to get the wheel to fit. biggest problem I've seen is very short head tube length. Shorter it is, the more wear and tear on the head set not to mention mor finicky in adjustment.

As tri-girl says, 650C wheel definitly has advantages over 700C wheel in accleration. You can "spool up" much faster on 650C. It takes lot more energy to spin up the 700c then it is with 650C (its physics of things and unless you are god there ain't much you can do about that). Faster spin up means faster acceleration. The whole thing revolves around a thing called angular momentum.

My old Ti bike had a 650C wheel and it was comfortable.

cons: choices of wheels are limited and less manufacturers are building 650C wheels. less choice in tires too. I wanted velomax orion?/circuit? or asscent wheels but they only came in 700C (I think velomax is part of easton now). I just checked yes velomax is now part of easton hmmm they now have 650C asscent/orion/circuit.

If you race see eden's comment. also at UCI sanctioned race, 650C wheels are not allowed for TT's (atleast that is what I remember).

Go with what is comfortable. They are still enough choices for 650C wheels.
And I think Tri people still prefer the 650C wheels so it wont be discontinued any time soon.

smilingcat

[Eden]

If you race see eden's comment. also at UCI sanctioned race, 650C wheels are not allowed for TT's (atleast that is what I remember).

As long as *both* wheels are 650 it's OK (at least it is for USACycling - better be cause my TT bike has 650's - and I don't think the rules vary too much from UCI). You can't have an odd wheeled bike - think getting ultra aero, by having a smaller wheel on the front than on the back.

[wiseowl]

I should specify that I do not race, nor do I ever plan to...but your comments are still very helpful and I am sure there are others in my boat who do race. Glad to hear the "extra" pedalling doesn't seem to hurt much- my DH is a stronger biker than me so we are always trying to find ways to eqalize us for rides together, and I am concerned the 650s would be one more notch against me. Out of curiosity, how tall are those of you on 650cc?

[Aggie_Ama]

My bike I got in December has 700's and the only plus I see is if I were to have a flat more riders would have a tube. My frame (like the Specialized Ruby) was designed to eliminate toe overlap and use the 700's but most frames are not designed this way.

My old 650's were just fine. My new bike is stiffer and therefore climbs better and accelerates faster but overall it is just a better designed bike. I cannot even compare it to my Steel bike that had 650's because everything about them is different.

As TriGirl said, 650's look much better on a small frame. My little 47 cm frame looked pretty darn goofy with 700's and it took me a while to not think that!

Equalize your rides by getting a frame that fits and working on your weaknesses. My DH is a speedy guy, so I am working on hills to keep him from dropping me. I get a better workout but he loves riding together.

And I just saw you can get some nice Mavics (Kysrium Elites) for cheap in 650, darn it those are better than mine!! BTW I am 5'2" and many frames for me have 650's.

[Tri Girl]

I'm barely 5'3" if that helps.

[amymisk]

I'm almost 5'1" and ride a bike with 700s. I agree the large wheels can look a bit goofy on such a small frame, but I got over that quickly. My old bike had 650s but I can't compare them.

I agree with most, go with what fits well, who cares if it has 650 or 700.

[DebW]

My new custom Peter Mooney bike has 650 wheels and 26" wheels. I haven't noticed a difference in speed or acceleration relative to my older bike with 700s. I'm 5' 7" with a 32" inseam so could easily ride 700s except that my ideal top tube length and size 9 feet would have produced toe clip overlap with an ideal front end geometry. The handling of this bike came out so perfect that I wouldn't trade it for wider tire availability.

If you want versatility in tire width, then having both 650s (for 650x23 racing tires) and 26" (for 1.3" or wider touring/mtb tires) on the same frame is a good way to go. Switching wheels requires moving the brake pads up or down a couple millimeters. I was disappointed in the few options for 650 rims, since I built up my own on 28 hole hubs.

[Torrilin]

For most people, wheels are wheels, and as long as they're not flat, they do fine. The point where wheels matter is when you're stressing them. So for a race, bigger and skinnier can matter. For a bike tour or a heavier rider, you'd worry more about enough spokes. For ordinary riding, you can have fun on a bike with 16" wheels (like folding bikes) or on bikes with 29" wheels, and everything in between. So as long as the bike fits well, I wouldn't worry.

(I'm having fun with 26" wheels. No toe overlap, despite having big feet and short legs)

[JmcG]

I ride both 650 and 700c wheels, and am 5'1". My Cervelo P3 (size 48) has 650s, my Specialized Ruby and Dolce (size 44) have 700s. I agree with others that it's an easy acceleration on the 650s, more so than on the 700s, but I also wonder if that's a function of gearing as well. I think you won't be disappointed going either way. Have you tried them both out? Also, like others have mentioned, for the 650s you're more limited in wheels and tires, and make sure you have spare tubes with you b/c it's more than likely that others will be riding 700s.

Sorry I don't have better advice. Go with your gut feeling - you won't be disappointed in the 650s if that size bike fits you better. Good luck!

[amymisk]

I just have to hijack for a brief moment:

I have fallen in love with Cervelo bikes and am soooo jealous of those who have them!!! Beautiful bikes, no local dealer that I can find.