Seat post length?

corblimey

Gonna get myself one of these to see if it makes a difference to my ongoing cycling issues (advice from LBS) but I wasn't expecting 2 different lengths. One is 367mm, the other is 410mm. I was just going to get the 367 as I'm quite short, and my saddle isn't that high, but if there's room, why not just get the 410? Could I have trouble fitting the whole 410 into the frame?

It's a 2009 Giant Defy 3 and afaics, the Giant website only lists diameter (30.9), not length?

C3PO

Why not measure your current seat post and buy the one that is closest in length to that?

corblimey

I would do, but I have no idea how to get the seatpost out of the frame. Is it just a matter of unscrewing the clamp and pulling it out? I don't want to undo something and my wheels fall off!

ford2600

corblimey wrote: »

I would do, but I have no idea how to get the seatpost out of the frame. Is it just a matter of unscrewing the clamp and pulling it out? I don't want to undo something and my wheels fall off!

Measure height of saddle above bottom bracket for reference when your fitting new one. Maybe measure ditance from tip of saddle and seatpost to centre of handlebars also

Work awau unscrewing seat post collar, it's not difficult

Tonyandthewhale

There's a seat clamp holding your seat post in place. Get yourself an allen key and open the nut and the post will slide out. It works the same as the quick release clamp on the dublin bike bikes and thousands of noobs man-handle them every day with no ill effects.

piston

Just so long as you have at least two inches inside the frame, it should be fine.

corblimey

Okay, post detached, but how now to measure, from the bottom to the top of the clamp? The post itself says "minimum 375mm" and that looks to be about the measurement from bottom to top.

Is it weird that it states min of 375? Half of the post was in the frame, which means that my seat is about 170mm above the clamp - but if that's the minimum, then I guess I have to go for the 410mm option.

dquirke1

I'm going to guess the "minimum" refers to the minimum insertion mark. Is there a line or some other mark nearby?

375mm is the length so the 367mm will fit your bike fine

corblimey

dquirke1 wrote: »

I'm going to guess the "minimum" refers to the minimum insertion mark. Is there a line or some other mark nearby?

There's nothing but shagging lines

About 120mm from the bottom, there's a line (and the writing Minimum 30.9x37.5 underneath that line) and then every 10mm above that, there are lines going up the post all the way to 150.

Oh, I get what you're saying now, the line above that Minimum is the how far up the post can be out of the frame. The measurements below are not connected.

Ok, 367 is on its way...