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Old January 22nd 18, 11:25 PM posted to rec.bicycles.tech
Joerg[_2_]
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Posts: 6,016
Default 700c 25mm tires on Weinmann ZAC19 rims ok?

On 2018-01-21 22:08, Tosspot wrote:
On 21/01/18 22:18, Gregory Sutter wrote:
On 2018-01-20, Joerg wrote:
Are 700c 25mm road bike tires ok on these or is that pushing it? The lip
to lip dimension inside is 19mm. Says 28 but maybe someone knows whether
25mm would fit.

http://www.weinmanntek.com/Products/MTB/ZAC19.htm

Reason I ask is because I could potentially get a nice rear wheel with
12ga spokes. My current one breaks spokes all the time plus the rim will
soon be up anyhow.


Not recommended. Use a 28mm or wider tire on a 19mm rim.
http://www.sheldonbrown.com/tire-sizing.html#width


Uh-oh, looks close.


Additionally, on a frame/fork that can only accept 25mm or smaller
tires, your 25mm tire may end up too wide to fit when mounted on a
wide rim, so be careful.

You might look for wheels with double-butted spokes; they will be
stronger and you'll break fewer spokes!



Problem is, I can't exceed 130mm between the dropouts for the wheel and
even that's a stretch (the frame is 126mm). This limits the selection of
ready-to-go wheels.


I've done it, and it was marginal. Not so bad as a "NONO! Don't do
that!", but, well, a bit close.


As long as the tire won't come off, dig itself into the rim or slide
around on there I'd be ok.

--
Regards, Joerg

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