Stem length

STEFANOS4784

If i rode it like my knees would be so behind the Crank that, as i said, would be similar to recumbrant :?

STEFANOS4784

P.s sorry shouldn't have refered you to that piccie without checking it :roll:

Chris James

reddragon is right. The size of your frame is irrelevant as the seat post just continues in a straight line from where the seat tube left off.

In this case having loads of post showing is only the same as having loads of tube (i.e. a bigger size).

The important thing is the angle of the seat tube. Steeper will leave the rider sitting further forward assuming the same seatpost and position on the saddle rails is used.

tomb8555

STEFANOS4784 wrote:

P.s my Kuota is Ksano and it's now wrapped up for the winter
This is definately a brake down in communication, probably my fault but hey-hoe life goes on

Yes I think a slight misunderstanding. Let me see if I can explain.

Now, as you mentioned, you have a small (for you) frame and so have a lot of seat post showing. I see where you're coming from in thinking that as the seatpost is longer it's ending up further backwards, as it's at an angle, right?

So let's forget about the rest of the bike and just think of the seat tube of the frame, and the seat post. On both a large and a small frame fitted to the same person, the overall height of the seat (relative to the BB) is going to be the same. On the small frame there'll be a lot of seat post showing, but on the larger frame less will be showing as the seat tube is longer. But overall the seat tube/seat post combo is exactly the same length.

I think that's where you're getting slightly confused. Yes if the frames were exactly the same size and one had more seat post showing then you'd have more set-back, but the whole point is that the frames are not the same size, so the extra seat post showing corresponds to a shorter seat tube on the frame.

When you bring seat tube angles into it, the smaller frame has a steeper seat tube, and so the whole seat tube/seat post combo is slightly more vertical than on the larger frame, resulting in your saddle being further forward.

Therefore, with a smaller frame but the same distance from saddle-BB, you'll need more set-back to achieve the same position.


EDIT: Chris James said all that a lot more concisely than I did :-)

daviesee

I can see where the stem angle would be important but surely the length is what determines comfort.





Or is that girth?

A question on stem length.

2 pages.

No double entendres?

Come on?

STEFANOS4784

Right ok, sorry to drag this along but feel i owe Reddragon apology, there done it...........
*goes off to sulk* (only joking ) This is what forums are for


P.s, definately girth 8)

fooshnicken

I changed my 1100mm to a 900mm and it felt a bit more comfortable. Mine was a best guess based on where my hands were compared to the hoods to where I felt comfortable. I also found that once I changed the stem I was able to ride on the drops in more comfort too.

chriskempton

fooshnicken wrote:

I changed my 1100mm to a 900mm

Yeah but it was still 3 f**king foot long

justresting

fooshnicken wrote:

I changed my 1100mm to a 900mm

That's what I call a stem :shock: