Like Joe B, I dont know about hamstrings vs quads, but is *seems like *you
are* too stretched out* on the 54.5cm AHH-MIT, mainly since you are using a
very short stem length and a very short reach bar.
Also, a 54.5 AHH-MIT has equal STA and HTA, STA=71.5°. HTA=71.5° so the
bars are coming back to compensate for the slacker HTA (and also to give
enough Front Center to prevent TCO). Therefore, the slack STA is not your
problem, the long TT is probably contributing to your being stretched out.
Lets assume you are too stretched out. Your options are:
1 Get a seatpost with less setback, see below
2 Push the saddle all the ways to the BACK of the saddle rails to move the
saddle forward. This can give you 2 to 4 cm or more depending on the
saddle used (a B17 is at the low end of the range, 2.4cm.
3. Move the bars UP to either at saddle height or above it. This is a
small effect and based on the 71.5° HTA, the distance you move BACK (x) is
either
0.335 x y, where y = the VERTCAL distance the bars are raised, y is in
CM and x is in CM
0.317 x Z, where z = the DISTANCE ALONG THE STEM QUILL the bars are
raised, z is in CM and x is in CM
If you move the bars UP 2cm the bars will come back 0.67cm or 6.7mm, not a
lot
If you are *too cramped*, then just increase the stem length or get a
longer reach bar like a Noddle.
RBW gives the following seatpost setbacks (in mm) on their SEATPOST tab
Nitto Lugged: 40
IRD Wayback 10 to 50
Paul 26
Nitto S83 (2bolt) 20
Nitto S65 (1bolt) 18
Assuming the RBW values are consistent (reflecting the relative setbacks of
the 4 posts), then replacing the Nitto Lugged post (40mm) with a
S83 or S65 (20mm either) will reduce your REACH to the bars by 2.0 cm.
A IRD Wayback will reduce it by 3.0cm at the minimum setback setting.
A zero setback post will give you 4.0cm closer to the bars
This saddle movement may be enough. Seatpost are not cheap to experiment
with
I think you are 2 to 4 cm too stretched out from what you said.
We can calculate the center of saddle to center of stem clamp or end of
bars for the 54.5 AAH-MIT and compare it to a bike you have and which you
are comfortable, essentially transferring the fit to the 54.5 AHH-MIT.
For example, Assuming your Saddle Height (SH) is 76cm (PBH-10), then a
54.5cm AHH_MIT has 57.4 cm between the seatpost center at 76cm SH (no
saddle) & the center of the stem quill bolt (bars LEVEL with seatpost at
SH), from the 71.5° frame angles, Let me know if you want to try this.
John Hawrylak
Woodstown NJ
On Thursday, March 3, 2022 at 11:24:22 PM UTC-5 atreya...@gmail.com wrote:
> Group , need your thoughts on drop bar fit . I recently bought homer
> Hilsen ( most recent batch ) . I have short torso but long legs and arms .
> My height is 5’8.5 ish and pbh is 86.5. I have homer in 54.5 , which has tt
> of 57.5. I am running a short stem 50mm and nitto m151(75 mm reach) . I am
> also using nitto lugged seat post , which I understand has a lot of set
> back.The reach seems to be working fine , however I do find my hamstrings
> are getting taxed way more than I like compared to my quads especially on
> climbs in the saddle . My understanding is that homer has a slack seat tube
> angle of 71.5. Will running a zero set back seatpost help ? Has anybody run
> zero setback posts on rivs. I understand that general recommendation is to
> have more set back .
>
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