I can fit the frame in size 56.5cm with a 130mm stem OR the size 58.2cm with a 110mm stem. I am leaning towards the 56.5cm with a 130mm stem. Right now I ride a 57.5cm with 120mm stem. The longest stem I have run is a 120mm.
What are the pros/cons of running such a long stem? Any benefit of running the longer top tube with a shorter stem?
09 Cervelo P3
10 Stevens Team Carbon
yourdaguy wrote:Yes, lower head tube is another reason to go with a smaller frame. I am 5'10" and I generally ride 54's with no spacers and have sold 56 frames because I could not get the bars low enough without a negative stem. But I am one of very few people that have this problem. I can touch ground with flat palm and knees locked. Most can't get far past touching ground with fingertips. The difference is around 4" and translates fairly straight (not quite linear relationship) to comfortable bar height.
I am very flexible also - no problem putting my palms on the floor with locked knees, but I am more comfortable with a relatively standard drop of 8 cm. There is more to this issue than just flexibility. Worth checking power and heart rate at various levels of drop.
wheelsONfire wrote: When we ride disc brakes the whole deal of braking is just like a leaving a fart. It happens and then it's over. Nothing planned and nothing to get nervous for.
All things being equal - they never are - you *may* be able to run a 110 stem with no stack/spacers where as with the smaller frame you *may* need to run spacers or a different angle stem. However, running spacers actually shortens the reach via negative reach - see the comment below -.
pros are no more flexible than your average athlete, they just happen to have their bikes fit correctly.
Q-FACTOR IS A RED HERRING
While the comments about reach and stack are valid, if the maufacturer doesn't list them, there are other ways to closely approximate the same values, by correcting the TT length for any difference in the STA and comparing head tube lengths, with the headset. In this case, the reach difference due to the STA difference is quite small - only 2-3mm.
http://www.specialized.com/us/en/bc/SBC ... temId=9256
elviento wrote:Sorry I am going off topic a bit -- who offers a "58.2cm" frame? Haven't seen any company going beyond centimeters.
You're not off topic. It's called a "58cm" by Specialized, but the actual measurement is 58.2cm. Maybe the virtual seat tube (if it were not compact geometry) would be 58cm? Who really knows how they come up with the sizing label these days. Each company seems to do it their own way.
yourdaguy wrote:In general, you are probably better off with the shorter of 2 sizes of frame because your seatpost will often be too short on the larger size. Also, the shorter frame will tend to be more comfortable since you will have a longer post sticking out and more impact absorption.
In general, how much seatpost should be sticking out on a standard geometry (not compact geometry) bike?
Those who wanted less saddle to bar drop would pick the largest size and those want more would pick something smaller. Riders with short legs and long torso might lean toward the larger sizes, just to get enough reach.
FWIW, with a 73cm saddle height, the largest frame I ever owned was 55cm c-t (frames sizes without a c-t or c-c designation are not complete). The top of the saddle would be about 17cm above the TT. These days, I'd select a 53cm c-t or 51cm c-c. My current LOOK 585 frames are 51cm c-c, but the TT slopes 6cm, so I have a very large standover clearance of about 10cm. Even so, a 350mm post has about 50mm more length than I need.
I also have a couple of 57.5TT bikes with 120 stems, and I found the transition to 56.5 with 130 stems very easy. Longer stems theoretically put your weight a little more forward in comparison to the mass of the frame than shorter stems with longer TTs. I'm not sure I notice a difference in my riding.
I agree that sometimes those bigger frames have HTs that are kind of tall, and as I noted in my Parlee Z5 thread not all HTs start and stop at the same point even if their height is the same.
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