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01-07-18 | 12:22 AM

#7

gugie

Bike Butcher of Portland

Joined: Jul 2014

Posts: 12,372

Likes: 7,738

From: Portland, OR

Bikes: It's complicated.

Quote:

Originally Posted by Andy_K

I’ve tried this with two frames (both with a flat edge on the front of the lug, as merziac mentioned is needed) and both gave me a simple reading with no trouble. I already had seat posts for these frames so I happen to know it gave me the correct answer. I’ve never had any success trying to do this with calipers.

Any mechanic, technician, or engineer that's ever tried to measure a hole with calipers will tell you that it's not terribly accurate. When you're trying to measure a seatpost, and an error of 200 microns will give you the wrong answer, you want the

Quote:

Originally Posted by repechage

I would really want a step graduated sizer, about 3 cm long per size...
27.4 to 25.0 in .2 cm increments.

I bought a set of Stein gradated seatpost sizers that go up to 31.6mm for $35 on eBay, shipping included. But that's just luck.

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