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What size seatpost?

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What size seatpost?

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flag SJwowza
Posted: Jul 18, 2017 at 14:16 Quote
I just recently bought a 2009 atomlab pimp 2 frame and it needs a seatpost but I'm not sure what size to get, I've looked everywheres and can't find anything on the frame let alone the seatpost size.
flag ScottVlovesMTB
Posted: Jul 18, 2017 at 15:58 Quote
SJwowza wrote:
I just recently bought a 2009 atomlab pimp 2 frame and it needs a seatpost but I'm not sure what size to get, I've looked everywheres and can't find anything on the frame let alone the seatpost size.

I believe the seat post size is 26.8 and the seat clamp size is 28.6
flag Aaronz25RS
Posted: Jul 18, 2017 at 15:58 Quote
I found the clamp size 25.4, my guess is 22.2 like that of a BMX bike.. you could always measure it..

http://www.treefortbikes.com/product/333222351165/338/AtomLab-Pimp-2-Frame.html
flag yogegoy
Posted: Jul 18, 2017 at 16:20 Quote
Use a caliper to give you an accurate reading when the tube is in relaxed condition (free from any tension). It will be in millimeters reading, then go to Thompson website and find what they offer. If you cant find exact size, you can always use a shim using sizes going down.
flag Minx20
Posted: Jul 26, 2017 at 18:35 Quote
I've got same bike, fairly sure my post is a 25.4mm, so clamp will be a 28.6mm.

I'll confirm once I get home

photo
flag Minx20
Posted: Jul 26, 2017 at 19:22 Quote
Confirmed - my '09 Pimp 2 running a 25.4mm post and 28.6mm clamp
flag cmc4130
Posted: Jul 28, 2017 at 8:55 Quote
Aaronz25RS wrote:
I found the clamp size 25.4, my guess is 22.2 like that of a BMX bike.. you could always measure it..

http://www.treefortbikes.com/product/333222351165/338/AtomLab-Pimp-2-Frame.html

I think you meant 25.4 post. 22.2 hasn't been a normal bmx seat post size since the mid 90's. (Standard was one of the first to switch to 1" seat posts, then everyone did in the mid school years). Cool
flag Aaronz25RS
Posted: Jul 28, 2017 at 9:28 Quote
cmc4130 wrote:
Aaronz25RS wrote:
I found the clamp size 25.4, my guess is 22.2 like that of a BMX bike.. you could always measure it..

http://www.treefortbikes.com/product/333222351165/338/AtomLab-Pimp-2-Frame.html

I think you meant 25.4 post. 22.2 hasn't been a normal bmx seat post size since the mid 90's. (Standard was one of the first to switch to 1" seat posts, then everyone did in the mid school years). Cool


I found one mention of seat post anything and it said clamp size 25.4, subtract 3 from that and you end up right at 22ish.. so that's what I went with
flag yogegoy
Posted: Jul 30, 2017 at 9:10 Quote
Stop guessing if you can't afford a micrometer or a caliper. Pull the seat post out of the seat tube and invert it so you'll measure the end of the open tube. Some yellow tape measures used by your mom for sewing have both measurements in inches and centimeters. Measure the widest part of the tube and be done with it. In centimeters, each increment will be in millimeters which is the measurement used by the industry.
flag cmc4130
Posted: Aug 10, 2017 at 6:54 Quote
Aaronz25RS wrote:
cmc4130 wrote:
Aaronz25RS wrote:
I found the clamp size 25.4, my guess is 22.2 like that of a BMX bike.. you could always measure it..

http://www.treefortbikes.com/product/333222351165/338/AtomLab-Pimp-2-Frame.html

I think you meant 25.4 post. 22.2 hasn't been a normal bmx seat post size since the mid 90's. (Standard was one of the first to switch to 1" seat posts, then everyone did in the mid school years). Cool


I found one mention of seat post anything and it said clamp size 25.4, subtract 3 from that and you end up right at 22ish.. so that's what I went with

I think that website must be incorrect. It's not the "seat collar diameter" that is 25.4, it's the seat post itself.

Item Specifications
TT (Effective) 22.3 ins
Wheel Size 24",26"
Headset Type 1-1/8" Standard Cups
Disc Mount Type 51mm I.S. Rear
Fork Travel 80-100 mm
Weight 5.4 lbs
Steerer Tube 1-1/8" Threadless
Brake Usage F/R Rear
BB Thread Type English
Seat Collar Diameter 25.4 mm
Rear Axle Type 10x1

Apparently, Atomlab made seat posts in various diameters: 25.4mm / 26.8mm / 27.2mm / 30.9mm
http://www.resurrectioncycles.co.uk/product/atomlab-pimplite-pivotal-seatpost/


The Atomlab Trail King came with 25.4mm one year and 27.2 another year:
https://www.pinkbike.com/forum/listcomments/?threadid=91552
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