New Seat Post not going on...
05-02-20, 03:20 PM
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New Seat Post not going on...
I all. Continuing my Trek 660 project.
Bought an Origin 8 seat post @ 27.2 mm ... the Compe-Lite model. Won't slide down. I can get it to start, but that's all. Did I buy the wrong size?
My bar mic doesn't do metric very well, but the old post measure 1.063-1.064" at the bottom....more like 1.069" at the top. The new post is 1.069".
Thanks.
Bought an Origin 8 seat post @ 27.2 mm ... the Compe-Lite model. Won't slide down. I can get it to start, but that's all. Did I buy the wrong size?
My bar mic doesn't do metric very well, but the old post measure 1.063-1.064" at the bottom....more like 1.069" at the top. The new post is 1.069".
Thanks.
05-02-20, 03:23 PM
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We need pictures of the seat binder bolt area, from behind.
Also, if you're really bored you could just sand down your new seat post to the right size.
Also, if you're really bored you could just sand down your new seat post to the right size.
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05-02-20, 03:30 PM
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I made this video a few weeks ago, It might help you out if you have a dity seat tube.
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05-02-20, 03:37 PM
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05-02-20, 03:41 PM
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We just need to see if the slit in the frame back there is damaged or not. Sounds like it's probably fine, but pictures are needed for a clearer diagnosis.
I guess one with the seatpost in shot directly from behind, and one directly from above the seat tube without the post.
I guess one with the seatpost in shot directly from behind, and one directly from above the seat tube without the post.
05-02-20, 03:59 PM
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I'll second making sure the inside of the seat post is clean. A few years ago I got a '84 Trek 760. The grease in the seat tube was like fossilized concrete and and initially made removal and reinsertion of the seat post pretty hard. It was a pain in the (_!_) to clean out. Based on the minty state of the bike, I suspect it was the original grease.
05-02-20, 04:02 PM
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We just need to see if the slit in the frame back there is damaged or not. Sounds like it's probably fine, but pictures are needed for a clearer diagnosis.
I guess one with the seatpost in shot directly from behind, and one directly from above the seat tube without the post.
I guess one with the seatpost in shot directly from behind, and one directly from above the seat tube without the post.
By the way...I'm just getting back into this...is Phil Wood still the "go-to" grease?
Thanks again.
05-03-20, 06:57 AM
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We just need to see if the slit in the frame back there is damaged or not. Sounds like it's probably fine, but pictures are needed for a clearer diagnosis.
I guess one with the seatpost in shot directly from behind, and one directly from above the seat tube without the post.
I guess one with the seatpost in shot directly from behind, and one directly from above the seat tube without the post.
05-03-20, 07:04 AM
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Mr Obvious here:
What size was the old post?
What size was the old post?
05-03-20, 07:06 AM
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Did you take a 27.2 post out? Are you sure it is the correct size? I never put much stock in measuring a seat tube with a caliper.
This is the only way to measure a seat post.
This is the only way to measure a seat post.
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
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05-03-20, 09:54 AM
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Sounds like you got the wrong size post. 1.063 is 27.0 according to converting calculator.
I don’t know for sure, but according to THIS (at least for that year) it came with a Sugino SP-KC seatpost. In a quick search I was only able to find mention of 26.8 and 27.0.
Doea the old seat post have the measurement stamped on it somewhere?
I don’t know for sure, but according to THIS (at least for that year) it came with a Sugino SP-KC seatpost. In a quick search I was only able to find mention of 26.8 and 27.0.
Doea the old seat post have the measurement stamped on it somewhere?
05-03-20, 09:54 AM
#13
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I all. Continuing my Trek 660 project.
Bought an Origin 8 seat post @ 27.2 mm ... the Compe-Lite model. Won't slide down. I can get it to start, but that's all. Did I buy the wrong size?
My bar mic doesn't do metric very well, but the old post measure 1.063-1.064" at the bottom....more like 1.069" at the top. The new post is 1.069".
Thanks.
Bought an Origin 8 seat post @ 27.2 mm ... the Compe-Lite model. Won't slide down. I can get it to start, but that's all. Did I buy the wrong size?
My bar mic doesn't do metric very well, but the old post measure 1.063-1.064" at the bottom....more like 1.069" at the top. The new post is 1.069".
Thanks.
Measuring the interior of a seat tube is pretty much useless. You need either a gauge like bianchigirl posted, or a collection of seatposts in different sizes.
Judging by how rough the interior is, a 27.2 post may fit if the seat tube was properly milled with a seat tube reamer. Manufacturers sometimes use undersize seatposts to avoid this step.
05-03-20, 11:44 AM
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Deanodize and polish the post. Try it again. If it doesn't fit, polish it some more until it does.
05-03-20, 12:10 PM
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Sounds like you got the wrong size post. 1.063 is 27.0 according to converting calculator.
I don’t know for sure, but according to THIS (at least for that year) it came with a Sugino SP-KC seatpost. In a quick search I was only able to find mention of 26.8 and 27.0.
Doea the old seat post have the measurement stamped on it somewhere?
I don’t know for sure, but according to THIS (at least for that year) it came with a Sugino SP-KC seatpost. In a quick search I was only able to find mention of 26.8 and 27.0.
Doea the old seat post have the measurement stamped on it somewhere?
By the way...did a little bit of re-checking and my bike is the '89 model with the True Temper tube set/ Ultegra group.
05-03-20, 12:11 PM
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I am a little amused, It took a dozen posts for someone to do the simple math of converting inches to millimeters. (25.4 mm = 1 in)
That was the first thing I did when I read the opening post. The old post was 27.02 mm. No wonder a 27,2 wouldn't fit.
I'd put the old post back in and snug the seatpin up, then look at the slot in back and check to make sure it is still open. If so, I'd just get a 27.0 post. (Now, if the slot closes up, then you probably have a mis-shapened lug that started as a 27.2. Having it reamed to a round 27,2 with matching post would then be "right".)
That was the first thing I did when I read the opening post. The old post was 27.02 mm. No wonder a 27,2 wouldn't fit.
I'd put the old post back in and snug the seatpin up, then look at the slot in back and check to make sure it is still open. If so, I'd just get a 27.0 post. (Now, if the slot closes up, then you probably have a mis-shapened lug that started as a 27.2. Having it reamed to a round 27,2 with matching post would then be "right".)
05-03-20, 12:13 PM
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Get a small cylinder home, clean up the inside of the seat tube.
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05-03-20, 09:35 PM
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If you're messing about with old bikes, this is essential advice. A brake cylinder hone should cost less than $20 at your neighborhood auto parts store and be usable for cleaning out the rusty old seat tubes of many bikes.
(On the right, attached to the drill)
But... you still have to have the correct diameter seat post.
(On the right, attached to the drill)
But... you still have to have the correct diameter seat post.
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05-03-20, 11:20 PM
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