27.5 x 3.8" compared with 26 x 4.0

Overview Chat Bike Members News Women

This topic has 12 replies, 6 voices, and was last updated 8 years ago by futonrivercrossing.

Viewing 13 posts - 1 through 13 (of 13 total)

27.5 x 3.8" compared with 26 x 4.0
letmetalktomark
Full Member

Curious to see a side by side comparison of height and width.

I know some of those running Stooge frames are running 3.8″ 27.5 tyres so know they are out there.

I’m guessing they should be taller ……

Posted 8 years ago

rocketman
Free Member

IIRC height is the same to within 1 mm

Posted 8 years ago

scotroutes
Full Member

27.5 x 3.8? That’s obviously taller than 26 x 4, but who is making them?

Posted 8 years ago

letmetalktomark
Full Member

Hmm.

Do you run this combo?

Posted 8 years ago

rocketman
Free Member

My apologies it was 26 x 4.7

Ha!

Posted 8 years ago

letmetalktomark
Full Member

Bontrager Hodag 27.5 x 3.8

Posted 8 years ago

letmetalktomark
Full Member

Hmm.

Posted 8 years ago

Northwind
Full Member

It’s actually quite clever, in some ways- I put 4.8s in my bike designed for 4.0s and obviously it raises the bike and BB. Doesn’t bother me, it still rides fine but this way you can vary tyre size without varying tyre height. If you’re made of money and want to buy extra wheels, anyway. But it increases choice.

But Trek are Trek so inevitably when they saw a settled standard had to attack it, so now they’re doing 27.5 x 4.5.

Posted 8 years ago

firestarter
Free Member

I 27.5 3.8 dune on the horizon northwind?;)

Posted 8 years ago

Northwind
Full Member

Nah, tbh I know on paper the 4.8s have made it taller and I shouldn’t like that, but I’ve never really noticed 😆

The difference won’t be exactly what the maths says, tyre profiles vary as do pressures, a 26 x 4.8 probably “sags” more.

Posted 8 years ago

scotroutes
Full Member

FWIW, all the original Surly 26 x 4″ tyres were really 3.8s.

And my 27.5 x 3.5″ FatBnimbles really measure 3″.

I’d not be going off any manufacturers marketing dimensions.

Posted 8 years ago

Northwind
Full Member

Aye, tyre companies do like their rubber rulers.

Posted 8 years ago

futonrivercrossing
Free Member

Size will depend a lot on rim width.

Posted 8 years ago