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700c to 650b conversion benefits...

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700c to 650b conversion benefits...

Old 07-24-18, 05:47 AM
  #1  
Abu Mahendra
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700c to 650b conversion benefits...

Kindly enumerate the main benefits of 700c to 650b conversions.
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Old 07-24-18, 05:55 AM
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Most frames can fit a larger tire in the 650b diameter than 700c.
Bottom bracket height is similar for road+ 650b and road 700c (650b x 47mm is similar to 700c x 30mm) if that's what the frame was originally designed for
650b wheels are lighter than 700c
650b tires are lighter than 700c
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Old 07-24-18, 07:08 AM
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I'm sorry but this has been discussed over a million times already. Just do a tiny bit of google-ing or even just search the forum.

700C to 650B Conversion, Road Bike to Gravel Rig - BIKEPACKING.com
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Old 07-24-18, 09:02 AM
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Iíve been thinking about doing this, but 650b is still kind of an orphan size, so tire selection is limited.

Otherwise, I like the idea for one of my bikes.
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Old 07-25-18, 06:33 AM
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Originally Posted by Abu Mahendra View Post
Kindly enumerate the main benefits of 700c to 650b conversions.
The reason to convert is to be able to run a wider tire at lower pressure in the same frame for added comfort, traction, and stability.
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Old 07-25-18, 08:06 AM
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Originally Posted by Banzai View Post
Iíve been thinking about doing this, but 650b is still kind of an orphan size, so tire selection is limited.

Otherwise, I like the idea for one of my bikes.
There's a pretty decent selection now IMO:
Compass 3 or 4 models
Donelly Strada USH
Donelly MSO
WTB Byway
WTB Horizon
Panaracer Gravelking and Gravelking SK
Panaracer Pari moto
Terrene Elwood
Schwalbe G one Allround
Teravail Rampart
Maxxis Refuse

And I'm sure that there are others I'm missing.
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Old 07-25-18, 12:32 PM
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Originally Posted by cobra_kai View Post
There's a pretty decent selection now IMO:
Compass 3 or 4 models
Donelly Strada USH
Donelly MSO
WTB Byway
WTB Horizon
Panaracer Gravelking and Gravelking SK
Panaracer Pari moto
Terrene Elwood
Schwalbe G one Allround
Teravail Rampart
Maxxis Refuse

And I'm sure that there are others I'm missing.
Itís getting better. Still only one studded/winter tire Iíve found, and the primary reason I would convert would be to clear better winter tires.
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Old 07-26-18, 07:45 AM
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Originally Posted by JonathanGennick View Post
The reason to convert is to be able to run a wider tire at lower pressure in the same frame for added comfort, traction, and stability.
Got cha, thanks! But if so, following the stated rationale, wouldn't 559 (26") be even better than 584 (27.5")? I mean, there are wider amd more plus and fat tires for 559 than for 584...
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Old 07-26-18, 08:18 AM
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Originally Posted by Abu Mahendra View Post
Got cha, thanks! But if so, following the stated rationale, wouldn't 559 (26") be even better than 584 (27.5")? I mean, there are wider amd more plus and fat tires for 559 than for 584...
I suppose it depends on how wide one wants to get, and on what will physically fit into a given frame. I'm pretty happy with the 47 mm width for my gravel riding, and I like the outer diameter that I get from a 650b x 47 mm tire.

Two years ago I was able to convert a bike from 700c x 32 mm to 650b x 47 mm. Doing so transformed the bike and made it a joy to ride on all the local gravel and dirt roads that we have. The 650b x 47 mm tire though, is a little bit less in diameter than the 700c tire that it replaced. The geometry change is subtle, but I do notice the difference that it makes in steering and in bottom-bracket height. You would need to go very wide indeed -- and I have tried -- to get a 26er tire that would match the diameter of my 650b tire, much less that of the original, 700c tire.
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Old 07-26-18, 01:32 PM
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I have a bad back and shoulder and other getting older issues. I switched to a 650 bike with 42mm slicks and couldn't be happier feels super smooth riding much more pain free than I have for years. Most surprisingly I'm probably only about 1MPH off my averages for the same routes as when I road a much lighter fancier bike with 700x23's on it. I ride with 60lbs for road and deflate to 40 for gravel.
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Old 07-26-18, 02:24 PM
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Originally Posted by Abu Mahendra View Post
Got cha, thanks! But if so, following the stated rationale, wouldn't 559 (26") be even better than 584 (27.5")? I mean, there are wider amd more plus and fat tires for 559 than for 584...
Good questoin.

First - if you are putting 650 wheels on a bike that takes 700c, you will be lowering your bottom bracket. Check that this will not mess anything up.
I can't find any decent 26" tires any more, so that is a bummer. Selection is pretty limited.
larger tires tend to roll smoother because of the shallower impact angle. That's why mountain bikes do 29" tires.

There is a lot more, but its been said...
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Old 07-26-18, 02:47 PM
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Old 07-26-18, 03:46 PM
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Originally Posted by chas58 View Post
Good questoin.

First - if you are putting 650 wheels on a bike that takes 700c, you will be lowering your bottom bracket. Check that this will not mess anything up.
I can't find any decent 26" tires any more, so that is a bummer. Selection is pretty limited.
larger tires tend to roll smoother because of the shallower impact angle. That's why mountain bikes do 29" tires.

There is a lot more, but its been said...
Compass Rattrap pass 26 x 2.3 Naches pass 1.8 and Elk pass 1.125.

However I watched a guy (strong guy at that ) Suffer badly in a pain cave on a flat ride into the wind ride rolling on Rat Trap Pass tires. IMO 650 is the sweet spot.
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Old 07-26-18, 04:32 PM
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Originally Posted by Facanh View Post
I'm sorry but this has been discussed over a million times already. Just do a tiny bit of google-ing or even just search the forum.

700C to 650B Conversion, Road Bike to Gravel Rig - BIKEPACKING.com

Hmmm ... very helpful response
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Old 07-26-18, 05:55 PM
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Originally Posted by JonathanGennick View Post
I suppose it depends on how wide one wants to get, and on what will physically fit into a given frame. I'm pretty happy with the 47 mm width for my gravel riding, and I like the outer diameter that I get from a 650b x 47 mm tire.

Two years ago I was able to convert a bike from 700c x 32 mm to 650b x 47 mm. Doing so transformed the bike and made it a joy to ride on all the local gravel and dirt roads that we have. The 650b x 47 mm tire though, is a little bit less in diameter than the 700c tire that it replaced. The geometry change is subtle, but I do notice the difference that it makes in steering and in bottom-bracket height. You would need to go very wide indeed -- and I have tried -- to get a 26er tire that would match the diameter of my 650b tire, much less that of the original, 700c tire.
i estimate that a 60mm (2.35") tire on a 559 rim is the same diameter as a 47mm (1.85") tire on a 584 rim.
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Old 07-26-18, 06:51 PM
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Originally Posted by Abu Mahendra View Post
i estimate that a 60mm (2.35") tire on a 559 rim is the same diameter as a 47mm (1.85") tire on a 584 rim.
That might depend upon the tire. I'm not sure I know enough to make any general claims. My one experience is that last winter for fun I swapped my 650b x 47 mm wheel and tires for a 26er wheelset running a 2.3" Nokian Freddie's Revenz studded tires. The Nokians do run narrow, and maybe that's why their diameter was less than the 650b tires. The frame clearance wasn't there for me either. I ended up running some 700c x 38 mm Gravdals for the winter.

EDIT: Found some photos! Check 'em out. The bike was originally a 700c x 32 mm model that I converted to 650b x 47 mm, then briefly to 26 x 2.3". The big air gap under the fender is evidence of how the 26er tires were smaller in diameter than the 650b tires I had been running for months to that point. And the frame clearance (second photo) was just barely enough for me to risk a couple runs up and down the block before I called it a day and ordered up the Gravdals.




Last edited by JonathanGennick; 07-26-18 at 07:07 PM. Reason: To add images
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Old 07-26-18, 07:06 PM
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Originally Posted by JonathanGennick View Post
I suppose it depends on how wide one wants to get, and on what will physically fit into a given frame. I'm pretty happy with the 47 mm width for my gravel riding, and I like the outer diameter that I get from a 650b x 47 mm tire.

Two years ago I was able to convert a bike from 700c x 32 mm to 650b x 47 mm. Doing so transformed the bike and made it a joy to ride on all the local gravel and dirt roads that we have. The 650b x 47 mm tire though, is a little bit less in diameter than the 700c tire that it replaced. The geometry change is subtle, but I do notice the difference that it makes in steering and in bottom-bracket height. You would need to go very wide indeed -- and I have tried -- to get a 26er tire that would match the diameter of my 650b tire, much less that of the original, 700c tire.
Originally Posted by JonathanGennick View Post
That might depend upon the tire. I'm not sure I know enough to make any general claims. My one experience is that last winter for fun I swapped my 650b x 47 mm wheel and tires for a 26er wheelset running a 2.3" Nokian Freddie's Revenz studded tires. The Nokians do run narrow, and maybe that's why their diameter was less than the 650b tires. The frame clearance wasn't there for me either. I ended up running some 700c x 38 mm Gravdals for the winter.
a general rule of thumb that gets an aporoximate wheel diameter is (rim diameter + 2 * tire width).
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Old 07-27-18, 02:32 AM
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Originally Posted by Witterings View Post
Hmmm ... very helpful response
It is actually, maybe the guy doesn't know that Google exists or you can search the forum. You do a google search and immediately get an 18 minute GCN video, an article from ridinggravel.com, bikepacking.com etc.

Seriously tho this is like SRAM vs Shimano or something. Beat do death.

I did link a nice article tho!
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Old 07-27-18, 08:25 AM
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Originally Posted by Metieval View Post
Compass Rattrap pass 26 x 2.3 Naches pass 1.8 and Elk pass 1.125.

However I watched a guy (strong guy at that ) Suffer badly in a pain cave on a flat ride into the wind ride rolling on Rat Trap Pass tires. IMO 650 is the sweet spot.
If 26x2.3" tires created enough additional drag to slow him down so much on top of the rest of his bike and his body, he's not that strong.
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Old 07-27-18, 08:27 AM
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Originally Posted by ph0rk View Post
If 26x2.3" tires created enough additional drag to slow him down so much on top of the rest of his bike and his body, he's not that strong.
the smaller diameter isn't about drag!

why would you assume a smaller diameter tire causes more drag?
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Old 08-03-18, 04:25 PM
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