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10-09-13, 05:58 PM

#4

Zef

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Quote:

Originally Posted by shoota

I was just reading about stack height. I found my currently installed headset on ebay and it has some info that may be useful: http://www.ebay.com/itm/New-Old-Stoc...-/390647760690

So with that info can you determine any more diagnosis? Thanks!

I know that some of the treks from the era your is from came with Campagnolo components which use ISO dimensions...this marries up with your current headset being ISO speced.

The ISO spec as it relates to a headset is the fork crown race seat dimension which is 26.4mm. Shimano speced this headset in both ISO and JIS (27mm). There are sources online for Shimano crown races in both JIS and ISO specs...the only two issues I am unsure of are:
1. Is your 7410 headset JIS or ISO spec...and does that matter other than the fit of the crown race on the steerer?
2. Whether the angular area that contacts the bearing balls on an obtainable replacement shimano crown race is correct for your 7410 headset.

-j

Last edited by Zef; 10-09-13 at 06:06 PM.

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