Are 650B really more comfortable than 700C?

Especially for light weight issues concerning cyclocross / touring bikes & parts.

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fourfa
Posts: 46
Joined: Mon Sep 26, 2011 3:04 am

by fourfa on Mon Sep 16, 2019 5:05 pm

redbicycle wrote: ↑
Sun Sep 15, 2019 1:24 am
spdntrxi wrote: Try ReneHerse/Compass or some WTB byways.. I run my WTB byways @ ~30psi they are 650x47... and it's a couch.
At what weight are you riding at this PSI? I'm 200lbs and honestly a bit scared to try such a low (in my mind) psi.
I'm 200, I run my road GP5000TL at 90 psi (very smooth roads around here), I run my 650b wheels (WTB Ventures) at 40psi on road (rated max for these rims) and 25psi off. Haven't bottomed out yet
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by Weenie on Mon Sep 16, 2019 5:05 pm

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redbicycle
Posts: 37
Joined: Wed Aug 01, 2018 1:21 pm

by redbicycle on Mon Sep 16, 2019 11:00 pm

fourfa wrote:
redbicycle wrote: ↑
Sun Sep 15, 2019 1:24 am
spdntrxi wrote: Try ReneHerse/Compass or some WTB byways.. I run my WTB byways @ ~30psi they are 650x47... and it's a couch.
At what weight are you riding at this PSI? I'm 200lbs and honestly a bit scared to try such a low (in my mind) psi.
I'm 200, I run my road GP5000TL at 90 psi (very smooth roads around here), I run my 650b wheels (WTB Ventures) at 40psi on road (rated max for these rims) and 25psi off. Haven't bottomed out yet

Thank you


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LeDuke
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Location: Front Range, CO

by LeDuke on Tue Sep 17, 2019 2:35 am

My wife’s new gravel bike will have her running <20 psi with Tubolight inserts and 650x50mm tires.

Comfort, traction and speed.


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NS
Posts: 2550
Joined: Wed Nov 05, 2003 7:27 pm
Location: Manchester, UK

by NS on Wed Sep 18, 2019 10:49 pm

I run Maxxis pace 2.1 on my 650b at 30psi schwalbe g one 38s at 40psi on 700c
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emotive
Posts: 295
Joined: Tue Nov 01, 2016 10:40 am
Location: Melbourne, Australia

by emotive on Mon Sep 23, 2019 8:08 am

A 46mm x 700c tyre has 230 cubic inches of air volume.

A 52mm 650b tyre has 250 cubic inches of air. About 10% more air, so you could run air pressure 10% lower for the same amount of suspension.

However, being a bigger tyre you have more travel before risking a pinch flat, so you could drop MORE Than 10% and get a bigger increase in comfort and grip with the same tyre safety.

46mm is already a big tyre. For others considering the switch from 700x40 to 650x48, the numbers are 160ci vs 200ci, or a 25% volume increase.
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