.... (2) it's a nice frame that probably rides very well. Not the lightest bike, and limited tire selection (there are not as many high-end road tires for 26 x 1.5 as for 700c),
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Adrianna
I believe the Road Standard will fit you and if anything the TT may be a bit short which can be corrected with a longer stem or drop bars with greater reach. This is based on the following values for:
Road Standard (RS) 50cm STL and 52cm TTL but the frame angles are not provided. Let’s assume the frame angle are the same the 50cm Rambouillet. This is reasonable since as Saturday Mike pointed out the 50cm Ram and the RS are both 26” wheels and the Ram would be the closest Rivendell to the Road Standard. Here is a summary of the RS and Ram geometries
RS ST 50cm TTL 52cm STA Not Known HTA Not Know
Ram ST 50cm TTL 52cm STA 72.5° HTA 71°
Me and my bike: I’m 5’7” (close to your 5’5”) and I have a 88 Voyageur which fits me well with a 7cm stem, 10.4 cm C-C reach drop bars (Rene Herse Radonneur), and bar center at same height as the saddle. The Voyageur geometry is:
88 Voy ST 21” CT (53.3cm) TTL 54cm
STA 74° HTA 71°
If we compare my 88 Voy to the 50cm Ram, only the STA is different and you sit further back on the Ram. The difference is 1.3cm (50 x (cos74 -cos72.5)).
This means I would need a 52.7cm TTL on the Ram to have the same fit as I have on the88 Voy. The Ram has a 52cm TTL, which is less than what I need and I would probably use a 1cm longer stem (go from a 7cm stem to a 8cm stem) to obtain the same fit as I have on the 88 Voy.
So based on
this the 50cm Road Standard would fit you with a 6 to 8 cm stem and drop bar
with a 10 to 11 cm reach (C-C).
5cm stems are readily available so you have margin if your arms are shorter than normal.
Stems are available up to 12 cm, so you will always be able to get the setm length you need.
If you used a Nitto Noddle, you would need a 1cm longer stem since the Noodle reach is about 1cm shorter than the RH Radonneur.
Hope this
helps.
John Hawrylak
Woodstown NJ


On Jan 29, 2022, at 10:27 AM, 'John Hawrylak' via RBW Owners Bunch <rbw-owne...@googlegroups.com> wrote:
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Adrianna
Here are my answers to your questions
--Question 1: What is your usual distance from pedal center to top of saddle?
Saddle Height (SH) is measured from the center of the BB spindle to the top of the saddle along the seat tube. Not to a pedal located to some position in it’s rotation.
You can adjust the saddle so there is a slight bend in your leg when your on the saddle and the pedal is at 5 o’clock, but it is NOT Saddle Height. Pedal at 5 o’clock typically puts the crank arm parallel to the seat tube.
Grant Peterson has stated Saddle Height is related to PBH by SH = PBH – 10 to 11 cm. a few times in the Rivendell Readers. For example, I’m 5’7”, my PBH is 80.6cm and my SH is 70.5cm (set by someone watching pedal on my bike in a trainer). This difference is 10.1cm, very close to Grant.
SO if you your PBH, you can get a good approximation of your SH.
A 5’5” person typically uses a 170mm (17cm) crank arm. Even if you used a 165mm arm, the distance is reduced by only 5mm (0.5cm) which is very small change compared to the 87cm distance from saddle to pedal given my 70cm SH and I use a 17cm crank arm. Crank arm length is typically a fine tuning adjustment
--Question 2: What is your usual top of saddle (at seat tube centerline) and handlebar heights?
BAR HEIGHT is typically referenced to the Top of the Saddle, not to the Ground. Your bars are in 1 of 3 positions:
Bars BELOW the Saddle by XXcm
Bars EVEN with the Saddle, 0cm difference
Bars ABOVE the Saddle by XXcm
I keep my bars EVEN with the Saddle to 1cm BELOW the Saddle, depending on my fitness level. I find I am comfortable in the drops and prefer the drops vs the brake hoods.
15 to 20 years ago Rivendell recommended bars even with saddle. Now they say Bars above saddle. I feel my setting (Even to 1cm Below) are within their recommendations.
The lower the bars, your muscles are mor effective, but there is more weight is on your hands and your hands can get numb. The higher the bars are, less weight on the hands and you are more upright, but your muscles are less effective
If I read you diagram correctly, your bars are 3.5” (9cm) BELOW the Saddle (37” – 33.5”). This is an extremely LOW bar position, typically used by the pros.
-Question 3: What is your usual distance from top of saddle (at seat tube centerline) to handlebar center?
My distance (Saddle where ST would come through to center of the stem clamp) is 60.4cm on my 88 Voyageur (53.3cm STL, 54cm TTL, 74° STA, 71°HTA, 71cm SH) with Bars EVEN with Saddle and 1 7cm stem length. This along with a drop bar reach of 11.5cm (C-E) puts my back at a 45° or slightly higher position (back angle referenced to the horizontal).
This distance plus the Bar REACH results in your back at a certain angle to the horizontal. Long distances result in LOW back angles and mor weight on your arms and hands, Short distances result in HIGH back angles, you are more upright and less weight on arms and hands. 15 to 20 years ago Rivendell recommended a 45° back angle. Now they recommend HIGHER angles, more upright. I am comfortable with 45°, but it’s a personal choice.
Additional Info
I calculated the distance from Saddle to stem clamp for a 50cm Ramboiulet since it’s STL and TTL matched the Road Standard. The calculation assumes bars EVEN with Saddle and a horizontal TT.
Assumed a 69sm Saddle Height for you based on my 71cm and 5’7” height vs your 5’5”, a 7cm stem length and 26” x 32mm tires (radius = 31.6cm). Here are the 50cm Ramboilett geo, the STL was increased 1.9cm due to the 2° upsloping TT, and assuming the geo table is Effective TTL
STL 51.9cm, TTL 52cm, STA 72.5°, HTA 71°, BBD 5.5cm, Rake 4.25cm
Here are the results
Saddle to center of stem clamp, 59.0 cm
Trail, 6.4cm & Flop =2.0cm, both match the geo table
Front Center, 56.3 cm You will have 1.3cm of Toe Clip Overlap, most early Rivendells do
The minimum Saddle to stem distance would be 57.0 by using a 5cm stem (shortest available).
Based on this, this frame should fit you but you would need to determine your PBH, Saddle Height and what Saddle to stem clamp distance you need for a good back angle
John Hawrylak
Woodstown NJ
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