fucxms

I'm looking to replace the stock seatpost on my '77 Le Tour II. I believe it has a 15/16" seatpost shimmed out to 26.0mm, but I'm not able to obtain an accurate measurement. I read on another thread that other Japanese Schwinns of the era (Voyageur, Traveler) came with this size tube, so I'm assuming the 26.0mm figure is correct.

I need at least a little setback and a micro-adjust clamp. I've found the Kalloy Uno in 26.0mm diameter, but there are conflicting descriptions of its clamp, and no micro-adjust is a dealbreaker. I would prefer a "vintage" look (no black/carbon) and not to spend too much $$. Any tips?

rhenning

15/16 is way smaller than 26.0 so how could you shim it to make it bigger. For less than $20 you can buy a digital caliper that will give you the answer and use for the rest of your life. Roger

EjustE

There are Laprade seatposts in smaller diameters. I think that your bike takes a 25.8mm, but you might to want to take it to your LBS to have them measure the size of the seatpost it takes.

wrk101

+1 Measure the post (if you have a good micrometer), or take it to a shop. Do not guess, as seat posts come in 0.2mm increments (less than 1/100th of an inch). No way can you eyeball it that close. Use the wrong size, and you will damage the seat tube.

+1 I picked up a nice digital micrometer at Harbor Freight for $10. 15/16 inch = 23.8 mm, so you must be using a huge shim.

Scooper

Both the 1976 and 1980 Schwinn Parts & Accessories catalogs list part number 58 827, "Chrome plated, 25.4mm, as used on Le Tour and Traveler models" as the seatpost for the1020 carbon steel frame Le Tour models like the 1977 Le Tour II.

The easiest way to know for sure is to either measure the inside diameter of the seat tube with a caliper at several points around the tube (in case the seat tube is ovalized), or take the bike to a LBS with a seatpost measuring tool (which is a pair of tapered rods with progressively increasing marked diameters).

RobbieTunes

Kalloy makes a 25.0 and a 25.4 that are cheap, but 25.4 = 1", so if you're 15/16, you'd better check again. Measuring seems to be the answer.

Scooper

Here's a picture of the seatpost measuring rods. Most bike shops have these, and would probably check your seat tube without charging you.

EjustE

It might make sense for the OP to give the bike shop a call to see whether they have those and whether they measure post sizes. A good idea might be to order the post through the bike store (so to get the measurement for free) and it will be as cost effective (or more) that buying one from the web. Not all bike shops have these sizing rods because they cost $70-100 a set

fucxms

I just eyeballed it wrong. It's 25.4", but there is a ~3mm thick collar shim in the tube. I was just hoping to find a 2-bolt clamp in either size that is cheaper than a Thomson.