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Correct Seat Tube Measurement

Old 01-16-19, 10:22 AM
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cqlink 
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Correct Seat Tube Measurement

I picked up an old Jetter bike for $3.00 because I liked the paint. Trying to find a seat tube.

Seat tube OD = 32.9m or 1.295"
Seat tube ID = 25.4mm or 1.0"

What diameter seat post am I chasing?

Thanks!
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Old 01-16-19, 10:33 AM
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If it's an older high ten frame set the seat post size is mostly likely 25.4mm which was the most common size on these. This seems to match your measurements if there's a coop or friendly bike shop in your area you can get them to verify the size and pic up a basic post for $5-10.
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Old 01-16-19, 10:54 AM
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I wouldn't even consider that hi-tensile steel. 3.75mm is an incredibly thick tubing wall, unless the OP is advertently measuring the lug outer diameter, as opposed to the seat tube outer diameter. Normally, there would be about 0.2mm diamterical clearance between the tube and post,suggesting a 25.2mm post. However, that would be rare. More likely, it it uses the very common 25.4mm and the seat tube is measauring slightly under it's true nominal diameter due to distortion, pinching, corrosion, etc.
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Old 01-16-19, 01:21 PM
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