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[Carbon Fiber] Would this bike scare you?

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[Carbon Fiber] Would this bike scare you?

Old 12-05-22, 09:47 PM
  #226  
VegasJen
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Originally Posted by Lombard View Post
Do you mean a 650b tire? That's not an odd size. Pretty easy to find tires and build wheels that size. I have them on my gravel bike. Remember that a 650b is the same as a 27.5 in mountain bike sizing just as 700c is the same as a 29er in mountain bike sizing. If the bike fits you otherwise and you like it, no reason to disqualify it for 650b wheels and tires.
Ya, I knew 650 was a fairly common size, although I did not know it corresponds to 27.5. But another reason I really don't want to go with a 650 is all my other bikes run 700c wheels. I really dislike having inconsistency there. Unless it's really specialized, I would like the option of being able to interchange wheels/tires in a pinch.
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Old 12-06-22, 01:09 AM
  #227  
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Originally Posted by Lombard View Post
Do you mean a 650b tire? That's not an odd size. Pretty easy to find tires and build wheels that size. I have them on my gravel bike. Remember that a 650b is the same as a 27.5 in mountain bike sizing just as 700c is the same as a 29er in mountain bike sizing. If the bike fits you otherwise and you like it, no reason to disqualify it for 650b wheels and tires.
Originally Posted by VegasJen View Post
Ya, I knew 650 was a fairly common size, although I did not know it corresponds to 27.5. But another reason I really don't want to go with a 650 is all my other bikes run 700c wheels. I really dislike having inconsistency there. Unless it's really specialized, I would like the option of being able to interchange wheels/tires in a pinch.
There's two 650 wheel sizes - 650C and 650B. My guess is that when 650 is discussed in terms of a TT frame, it's probably 650C, not 650B.

650B are what's equivalent to 27.5 MTB wheels at 584mm BSD and are usually seen with wider rims for fatter tires. But, for all I know, there might be skinny 650B wheels for skinny road tires, but I'm just not familiar with them.

In contrast, 650C is 571mm BSD, and what I've seen is that 650C come with a skinnier rim for skinnier road tires, and is a wheel size for very small road bikes and some TT bikes.

And, 700C is 622 same as 29er, the difference being the width of the rim and the tires they'd take (skinny/road vs wide/mtb)

You can also see older TT bikes with a 700C wheel in the back and 650C in the front.

A fairly common use of 650B on the other hand - as opposed to a straight on 27.5 MTB - is to convert a 700C bike to 650B because you can use a 650B wheel with a fatter tire and equal the same overall height as a 700C wheel with a skinnier tire. More cushy. I have a set of each for my gravel bike: 700CX35 and 650BX50.

I hope corrections will be made if I misunderstand this.

Last edited by Camilo; 12-06-22 at 01:25 AM.
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Old 12-06-22, 07:41 AM
  #228  
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Originally Posted by Camilo View Post
There's two 650 wheel sizes - 650C and 650B. My guess is that when 650 is discussed in terms of a TT frame, it's probably 650C, not 650B.

650B are what's equivalent to 27.5 MTB wheels at 584mm BSD and are usually seen with wider rims for fatter tires. But, for all I know, there might be skinny 650B wheels for skinny road tires, but I'm just not familiar with them.

In contrast, 650C is 571mm BSD, and what I've seen is that 650C come with a skinnier rim for skinnier road tires, and is a wheel size for very small road bikes and some TT bikes.

And, 700C is 622 same as 29er, the difference being the width of the rim and the tires they'd take (skinny/road vs wide/mtb)

You can also see older TT bikes with a 700C wheel in the back and 650C in the front.

A fairly common use of 650B on the other hand - as opposed to a straight on 27.5 MTB - is to convert a 700C bike to 650B because you can use a 650B wheel with a fatter tire and equal the same overall height as a 700C wheel with a skinnier tire. More cushy. I have a set of each for my gravel bike: 700CX35 and 650BX50.

I hope corrections will be made if I misunderstand this.
Hmmm. Considering I don't have a tri-bike, I guess I'm unfamiliar with 650c wheels. I thought that was a more dated wheel size like 630mm wheels. So I stand corrected.

Going 700c to 650b is exactly what I did with my gravel bike. I was able to go from a stock 700c x 35 tire to a 650b x 42 tire thereby increasing tire width within the tire clearance limitations. At the same time, the smaller rim size very slightly increases my low gearing.
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Old 12-06-22, 03:23 PM
  #229  
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Originally Posted by VegasJen View Post
Ya, I knew 650 was a fairly common size, although I did not know it corresponds to 27.5. But another reason I really don't want to go with a 650 is all my other bikes run 700c wheels. I really dislike having inconsistency there. Unless it's really specialized, I would like the option of being able to interchange wheels/tires in a pinch.
This is a very valid reason to stick with 700c wheels. Your greatest number of options for tires will also be 700c.
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Old 12-06-22, 04:47 PM
  #230  
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Originally Posted by Lombard View Post
Hmmm. Considering I don't have a tri-bike, I guess I'm unfamiliar with 650c wheels. I thought that was a more dated wheel size like 630mm wheels. So I stand corrected.

Going 700c to 650b is exactly what I did with my gravel bike. I was able to go from a stock 700c x 35 tire to a 650b x 42 tire thereby increasing tire width within the tire clearance limitations. At the same time, the smaller rim size very slightly increases my low gearing.
I did that too on my wife and my gravel bikes. Mine, as a second set, to get a fatter tire, hers, as her only set with a 650BX35, to get a tad more standover compared to what she'd have with a 700CX35. She is very small of stature and wishes for more clearance when stopping. Since she also has short crank arms, it didn't really affect pedal strike.

But 650C are on more than TT bikes. They are found on very small framed regular road bikes. I almost bought one for her when I was looking for a nice road frameset for her, but decided not to because.......

Originally Posted by Eric F View Post
This is a very valid reason to stick with 700c wheels. Your greatest number of options for tires will also be 700c.
One of the reasons I didn't get the 650C bike for her new road bike as well as just not knowing how she'd like it. (she already was riding a basic XS 700C bike that she liked). Some day if I find a very good price on one, I might get it and build it up and see if she likes it better than her XXS 700C road bike - which she says she's perfectly happy with so no real motivation.

But, VegasJen , imho, there's really no reason to go with 650C the bike you're looking for because it's undoubtedly going to be larger than XXS or XS (i.e. in the "44" or "48" range).

Last edited by Camilo; 12-06-22 at 04:57 PM.
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