M2 Stumpjumper - '97 or '98?

Wylie · Oct 11, 2010

Just bought a 15.5" Stumpy from Emoco (getting posted tomorrow )

so i'm trying to source the right size front derailleur. Problem is that bikepedia states the '97 issue as having a 35mm seat tube (isn't this meant to be 34.9mm), whereas the '98 issue states a 31.8mm seat tube. Here's a link to some close ups that may help someone here identify the frames year for me.

http://gallery.me.com/paulobrienmusic#100111&view=grid&bgcolor=black&sel=3

Cheers

the great roberto · Oct 11, 2010

m2,m4 and m5 stumpys have 34.9mm seattubes with seatposts of 30.9.

Anthony · Oct 11, 2010

I think your frame is a 98 and I think your seat tube is a 34.9.

I think the bikepedia entry must be wrong in saying 31.8, as it also says that the seat post was a 30.9. A 31.8 ED tube that had an ID of >30.9 would be too thin to keep baked beans in, let alone build a bike out of it.

I'm pretty sure the seat post was indeed a 30.9 - the 99 seat post certainly was, plus 97, so why not 98? So I think the tube must be a 34.9.

the great roberto · Oct 11, 2010

bikepedia is often wrong andsome of those things are obvious. Saw one entry where seat post was 30.9mm and the seat tube was only 28.6mm :cry:

To my limited knowldge all alloy stumpys use 34.9mm front mechs

Wylie · Oct 11, 2010

Cheers for the replies guys, if my current XT mech was a bottom pull then i wouldn't even have to buy a new one - but at least i now know the correct size etc, 34.9 Bottom Pull. Cheers again

EDIT / UPDATE:

I just bought a vernier guage caliper and have now found to have the following:

Ext Seat Tube = 36mm
Int Seat Tube = 30.9mm

...so i think it's a 36.4mm Seat Clamp & a 30.9mm Seat Post that i need. Strangely enough i am using a 34.9mm front mech which seems to fine.

M2 Stumpjumper - '97 or '98?

Wylie

Retro Guru

the great roberto

Senior Retro Guru

Anthony

the great roberto

Senior Retro Guru

Wylie

Retro Guru

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