30.9 seatpost means 31.8 seatclamp right?

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This topic has 10 replies, 8 voices, and was last updated 14 years ago by tazzymtb.

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30.9 seatpost means 31.8 seatclamp right?
Rockplough
Free Member

I'd measure it but I'm at work.

Posted 14 years ago

foxyrider
Free Member

I usually make that mistake but as the metal is probably 2 mm thick each site so would have to be an outer diameter of 34.9mm 🙂 would have to mean that the seat tube is about 0.5 mm in thickness otherwise 😉

Posted 14 years ago

njee20
Free Member

Incredibly unlikely, much more likely to be 34.9 or bigger.

What frame?

Posted 14 years ago

snaps
Free Member

Depends on frame material.

Posted 14 years ago

JamesP
Free Member

36.9 on Specialized Stumpjumper Carbon HT – I don't think you can just guess. What bike is it?

Posted 14 years ago

Rockplough
Free Member

2009 Marin Wolf Ridge. I did think 0.5mm was a bit thin but then I thought 2mm sounded too thick.

Posted 14 years ago

njee20
Free Member

Depends on frame material.

Indeed, and with so few frames having a 0.45mm wall thickness, it's very unlikely to be 31.8.

If it's an alu Spesh it's definitely 34.9, if it's a Giant I'm pretty sure it's 34.9, if it's carbon then it's likely to be bigger, and a custom size.

Edit: it's only a wall thickness of 1mm, not 2mm.

Posted 14 years ago

Rockplough
Free Member

I'm an idiot. The front mech is 34.9 and I'm pretty sure the seat tube isn't tapered.

Posted 14 years ago

MrCrushrider
Free Member

ive got the same measurements on my heckler and its 34.9 seatpost clamp

Posted 14 years ago

Pauly
Full Member

Marin are 34.9 as well.

Posted 14 years ago

tazzymtb
Full Member

on the 2009 mount vision it's a 34.9 so your wool fridge should be aswell

Posted 14 years ago