Ritchey Mast Topper Diameters

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Valbrona
Posts: 1629
Joined: Fri Oct 28, 2011 3:25 am
Location: United Kingdom of Great Britain and Northern Ireland

by Valbrona

Ritchey state the diameters of their three WCS Mast Toppers as follows:-

30.25
34.9
38.35

Presumably, they are giving the diameter of the inner bore of the stubby. But what outside diameter of seat tube will these fit?

Or maybe the Ritchey numbers are wrong, because a seat topper with a bore of 38.35mm ain't gonna fit very well on a seat tube of 37mm.

Thanks for any comments.
Last edited by Valbrona on Wed Sep 03, 2014 3:13 pm, edited 1 time in total.

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Stolichnaya
Posts: 2621
Joined: Wed Oct 06, 2004 6:55 pm
Location: Vienna, AUT

by Stolichnaya

Don't overcomplicate this.

The Ritchey numbers are ID - internal diameter.
These seatmasts will fit seat tubes with the same number as an OD - outside diameter.

If you have a frame with a 37.0 OD ISP, then the Ritchey options are not for your frame, unless you cobble a shim together.

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