Quick question: Are Deda 31.7mm bars OK with non Deda stems?

Discuss light weight issues concerning road bikes & parts.
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hannawald
Posts: 172
Joined: Sat Dec 17, 2016 7:28 pm

by hannawald

I would like to buy Deda Superzero carbon bars, but they have 31.7mm diameter, not standard 31.8mm. Is it OK with non deda stem (Foil) or it is gonna be a problem?
Thanks!

Broady
Posts: 270
Joined: Thu Jan 03, 2013 5:02 pm

by Broady

Yeah, it will be fine. The standard is actually 1 1/4" which is 31.75mm. Most round up but for some reason Deda round down.

BdaGhisallo
Posts: 1886
Joined: Wed Mar 17, 2004 1:38 pm

by BdaGhisallo

Broady wrote:Yeah, it will be fine. The standard is actually 1 1/4" which is 31.75mm. Most round up but for some reason Deda round down.


Deda were the first to go with the new bar size at the end of the 1990s. They went with 31.7 as the marketed size. Other stem makers, late to the oversized party, went with 31.8 to differentiate themselves from Deda.

morganb
Posts: 533
Joined: Wed Mar 15, 2017 5:30 pm

by morganb

BdaGhisallo wrote:
Broady wrote:Yeah, it will be fine. The standard is actually 1 1/4" which is 31.75mm. Most round up but for some reason Deda round down.


Deda were the first to go with the new bar size at the end of the 1990s. They went with 31.7 as the marketed size. Other stem makers, late to the oversized party, went with 31.8 to differentiate themselves from Deda.

They also measure outside to outside on their bars while pretty much everyone else measures center to center. So if you are buying the stated size your bar is going be ~2cm narrower than listed compared to other bars.

MXGimp
Posts: 21
Joined: Wed Feb 15, 2017 7:26 pm

by MXGimp

They also measure outside to outside on their bars while pretty much everyone else measures center to center. So if you are buying the stated size your bar is going be ~2cm narrower than listed compared to other bars.


Thank you for this!

Broady
Posts: 270
Joined: Thu Jan 03, 2013 5:02 pm

by Broady

BdaGhisallo wrote:
Broady wrote:Yeah, it will be fine. The standard is actually 1 1/4" which is 31.75mm. Most round up but for some reason Deda round down.


Deda were the first to go with the new bar size at the end of the 1990s. They went with 31.7 as the marketed size. Other stem makers, late to the oversized party, went with 31.8 to differentiate themselves from Deda.


Ah, interesting to know.

hannawald
Posts: 172
Joined: Sat Dec 17, 2016 7:28 pm

by hannawald

thanks!

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