Just bought a dropper post so i need a bolt-on seat clamp to stop it going walkabout, inner diameter is 30.9, what size clamp do i need? 
Bike Forum
Silly seatclamp question
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Posted 4 months ago #
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take it 30.9 in the dropper diameter?
depends on you frame for the seat clamp size , alloy tube with be thicker than steel for example.
Might be an idea to mention what bike you have
Si
Posted 4 months ago # -
What size front mech clamp do you have? Its the same as that, most likely 34.9 on an ally frame
Posted 4 months ago # -
What size front mech clamp do you have? Its the same as that, most likely 34.9 on an ally frame
unless the seat tube is externally butted near the seat clamp.....
Posted 4 months ago # -
Probably 34.9.
Posted 4 months ago # -
Ooops! Its a Marin Wolf Ridge 6.8 2009 model
Just googled the bike and haven't found anyhting about the external seat tube diameter. The seatpost diameter is 30.9, not the internal seat tube diameter.
Posted 4 months ago # -
muddydwarf - Member
If they're not the same, you have a problem
The seatpost diameter is 30.9, not the internal seat tube diameter.
Posted 4 months ago # -
Well yeah, but the internal seatube diameter isn't going to be exactly 30.9mm is it? I work in engineering manufacturing and i know enough that 30.9 won't go into 30.9!
Actually, i wonder what the tolerance is...
Posted 4 months ago # -
well surely if you work in engineering you have access to a vernier caliper ?
Posted 4 months ago # -
I do, but its at work and i'm at home with an internet connection and a credit card!
Posted 4 months ago # -
Sorted Scotsman - ta for that, although i am a bit worried about how easily you found that thread... Do you have powers of total recall???
Posted 4 months ago # -
Google search (Marin Wolfridge seat clamp diameter) and up pops STW top of the page! But I am at work sitting in a hotel in deepest darkest West Africa (Nigeria) with nothing better to do!
Posted 4 months ago #
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