deda stem compatibility Q

i've got a ttt zepp xl stem & handlebar w/ a 31.8mm clamp.

i'm looking to get a longer stem and can get a good deal on a deda newton OS stem with a 31.7mm clamp.

is this 0.1mm difference anything to be concerned about?

won't work? fatigue the metal faster? it's really a consipiracy and both are 31.75mm?

thanks for your advice!

0.1mm difference will make no difference! (I had the exact same situation with a Deda Magic and 3t bar last spring, and it's working fine). I would guess you could take 10 stems from all the manufactures and find a variance in sizing by .1mm on 1 or 2 from each batch.

Personally I think it's a marketing ploy by Deda forcing you into thinking you MUST use their bar as well in order to get the proper and safe set-up/fit...

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"The only thing in this world that gives orders, is balls"
~ Ski-U-Ma! ~
"Know your limits... Then FK'N Crush'em!!!"

I made the exact change you did (Zepp to Newton) and had an annoying problem with a persistent creaking noise. I don't know for certain that it was an issue with the diameter change, but I then changed to another 31.8 stem and the creaking disappeared.

Having seen road stems on moutain bikes ( yes that worried me too ) and used mtb stems on road bars I can´t see that it´s more than a con but there is one stem made of magnesium where the manufacture does read the riot act about using a torque wrench to mount , stress risers and other scary stuff ( found it , ITM´s The Stem , all 95 grams of it ) .
If in doubt you could use a section from a coke can as a shim , often done to fit a straight mtb bar to a road bike but in that case you may need to use two .

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thanks for your input. too bad i'm going the other way with the stem clamp being 0.1mm smaller than the handlebars.

speedplay gave the same coke can tip for making a shim between their cleat (when in 4-bolt config) and a carbon soled shoe. "we sell official shims, but i suggest drinking a can of coke and cutting it with an x-acto knife"

not sure about the x-acto knife cutting the can, but i've got a Ginsu in a drawer somewhere!