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funct
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259 Posts
Discussion Starter · #1 ·
Hi folks, I have an oldish bike
with 753 tubes and superbe pro (7spd gen) on it.

I'm experimenting with my position and want to try 1" more setback.
Any ideas what diameter this is?

Looks to be about 26-27something mm without a micrometer.
Would you call that setback already?

Or just get a different seat?
 

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Resident Curmudgeon
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If I had to guess, I'd guess 27.2mm. If you can, take it to your lBS & have them measure it with a pair of vernier calipers. Many seatposts also have the size stamped on them, usually near the bottom end of the post.
 

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From memory, Reynolds 753 used a narrower seat post diameter than most, so probably not 27.2, more like 26.0, 26.4 - problem was there are so many variations and I presume there's no number stamped on the post. Best suggestion is to visit your LBS
 

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funct
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Discussion Starter · #5 ·
I like dissent.

I guess I should overcome my lobistophobia
or just get myself to a hardware store
for those vernier calipers.
Plumbers never have been concerned about those last (any of those?) decimal places.

So did 753 come in a wide array of tube profiles, sizes and butts
or was it quite specific for each tube?

And is that a zero setback seatpost?
Is the front bolt the defining point?
 

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thefunkyplumber said:
I like dissent.

I guess I should overcome my lobistophobia

And is that a zero setback seatpost?
Is the front bolt the defining point?
lobistophobia?

my understanding is that setback is from the center of the clamp to centerline of the post, so that looks like ~0.5".
So, there's no number stamped on that seatpost IDing the OD?

dissent is good!
 
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