Help identifying our bike

Jgross1966 · Aug 29, 2023

Last dumb/rookie question before I post this for sale… how can I confirm the size of the bike?

And any other tips of what to include in the language of my “for sale” post?

I am probably going to list for $450 and will see how much I need to negotiate down from there - I have had quite a bit of luck selling on FB marketplace so I think I’ll start there and avoid the Ebay Fees

thx again, all - I appreciate all of your advice.

jeff

tlg · Aug 29, 2023

Jgross1966 said:
Last dumb/rookie question before I post this for sale… how can I confirm the size of the bike?

And any other tips of what to include in the language of my “for sale” post?

I am probably going to list for $450 and will see how much I need to negotiate down from there - I have had quite a bit of luck selling on FB marketplace so I think I’ll start there and avoid the Ebay Fees

thx again, all - I appreciate all of your advice.

jeff

I wouldn't recommend selling on ebay. Fees are too high and shipping is expensive.

For the size, go to the website and look at the Geometry chart. The sizes are in Blue.

The easiest measurement to check is the Seat Tube Length (A in the picture). Measure from the center of the crank to the top of the seat tube.
But it looks like that bike has the same Seat Tube Length on a few sizes (that's unusual).
Next I would measure the Heat Tube Length (G)
Next I would measure the Wheel Base (J)
If those don't narrow it down, after that it gets tricky as the measurements are more obscure.

Next I would measure the Top Tube Length, Horizontal. You have to place a horizontal line (use a string or a level) and measure from the center of the head tube to the center of the seat tube.

Jgross1966 · Aug 29, 2023

Perfect, thx! And I totally agree about ebay.

tlg said:
I wouldn't recommend selling on ebay. Fees are too high and shipping is expensive.

For the size, go to the website and look at the Geometry chart. The sizes are in Blue.

View attachment 491870
View attachment 491872

View attachment 491871

The easiest measurement to check is the Seat Tube Length (A in the picture). Measure from the center of the crank to the top of the seat tube.
But it looks like that bike has the same Seat Tube Length on a few sizes (that's unusual).
Next I would measure the Heat Tube Length (G)
Next I would measure the Wheel Base (J)
If those don't narrow it down, after that it gets tricky as the measurements are more obscure.

Next I would measure the Top Tube Length, Horizontal. You have to place a horizontal line (use a string or a level) and measure from the center of the head tube to the center of the seat tube.
View attachment 491873

Jgross1966 · Aug 29, 2023

Looks like the measurement from the center of the crank to the top of the seat tube is 23 inches…

Lombard · Aug 29, 2023

Jgross1966 said:
Looks like the measurement from the center of the crank to the top of the seat tube is 23 inches…

In cm, that converts to a size 58. How tall is your wife? 58 is the correct size for someone who is just under 6 ft.

Jgross1966 · Aug 29, 2023

Lombard said:
In cm, that converts to a size 58. How tall is your wife? 58 is the correct size for someone who is just under 6 ft.

🤔 I must be measuring incorrectly. She’s about 5’2

Lombard · Aug 29, 2023

Jgross1966 said:
🤔 I must be measuring incorrectly. She’s about 5’2

LOL! Yeah, I would say. Her correct size would be more like a 48. Are you sure the size isn't stamped on the frame somewhere?

Jgross1966 · Aug 29, 2023

Haven’t been able to find the size stamped anywhere - I plan to post as a 48 (but will be up front that the buyer will want to measure for fit as well)

thx again to all for help. Postibg for sale tonight (if you know of anyone looking for a nice road bike that may or may not be size 48!)

thx again, all

jeff

tlg · Aug 29, 2023

Lombard said:
In cm, that converts to a size 58. How tall is your wife? 58 is the correct size for someone who is just under 6 ft.

No that's not how it works. The Seat Tube Length is NOT the size.
According to the Specialized chart, a size 56 has a 417mm Seat Tube Length.

23" = 584mm. His measurement is miles off. (6-1/2" off). My guess is he measured the seatpost, not the frame seat tube.

THIS is the seat tube length. And in order to measure accurately, you need to remove the seat post clamp.

duriel · Aug 29, 2023

Someone has been drinking my koolaide.
Some have run 30's on their tiagra's. Check your numbers.
Tiagra 11-30/50-39-30 vs 11-32/50-34 (?)
Tiagra hands down for the climb!

duriel · Aug 29, 2023

Jgross1966 said:
Looks like the measurement from the center of the crank to the top of the seat tube is 23 inches…

That would be 584mm, something is wrong.

tlg · Aug 29, 2023

duriel said:
Some have run 30's on their tiagra's.

It's out of spec. It may or may not work.

Except you overlooked that you can run a 11-34 cassette on new drivetrain and be IN SPEC.

Tiagra 11-30/50-39-30 vs 11-32/50-34 (?)
Tiagra hands down for the climb!

Tiagra 11-30/50-39-30 vs 11-34/50-34

30/30 = 34/34 🤣

cxwrench · Aug 29, 2023

Jgross1966 said:
Looks like the measurement from the center of the crank to the top of the seat tube is 23 inches…

Did you notice that nothing on that chart is in inches? Road bikes are metric. Take another look at the frame diagram where the frame is red. Look at 'A'. Measure it. I would confirm w/ head tube and effective top tube. It's all been explained.

Lombard · Aug 29, 2023

cxwrench said:
Did you notice that nothing on that chart is in inches? Road bikes are metric. Take another look at the frame diagram where the frame is red. Look at 'A'. Measure it. I would confirm w/ head tube and effective top tube. It's all been explained.

And just to clarify:

Inches x 2.54 = cm

Lombard · Aug 29, 2023

tlg said:
No that's not how it works. The Seat Tube Length is NOT the size.
According to the Specialized chart, a size 56 has a 417mm Seat Tube Length.

So then tell us how do you find out what size the bike is? Effective seat tube as in measuring from BB up to where the effective top tube would be?

tlg · Aug 29, 2023

Lombard said:
So then tell us how do you find out what size the bike is? Effective seat tube as in measuring from BB up to where the effective top tube would be?

I already did. You use the Geometry chart.
The listed bike size rarely, if ever, actually matches something you can measure. Surely not the seat tube length with a sloping top tube.

tlg said:
For the size, go to the website and look at the Geometry chart. The sizes are in Blue.

View attachment 491870
View attachment 491872

View attachment 491871

The easiest measurement to check is the Seat Tube Length (A in the picture). Measure from the center of the crank to the top of the seat tube.
But it looks like that bike has the same Seat Tube Length on a few sizes (that's unusual).
Next I would measure the Heat Tube Length (G)
Next I would measure the Wheel Base (J)
If those don't narrow it down, after that it gets tricky as the measurements are more obscure.

Next I would measure the Top Tube Length, Horizontal. You have to place a horizontal line (use a string or a level) and measure from the center of the head tube to the center of the seat tube.
View attachment 491873

Lombard · Aug 29, 2023

tlg said:
I already did. You use the Geometry chart.
The listed bike size rarely, if ever, actually matches something you can measure. Surely not the seat tube length with a sloping top tube.

The only thing on that chart that could possibly be used to determine frame size is the STACK measurement.

cxwrench · Aug 30, 2023

As tlg posted the 'size' of a frame rarely matches up to anything on the frame itself. Stack and reach are a great way to compare frames on paper but very hard to use if you have a frame sitting in front of you. In this case match up as many measurements as possible to the chart. Some tubes are the same size for more than one frame size. If you have a complete bike you can use effective top tube pretty accurately.

craiger_ny · Aug 30, 2023

I feel like their chart is unhelpful, especially to a layman. Ground-top...wtf is that? What is 'top-tube length-horizontal'? I feel like it might be an approximation of reach but it gets smaller as the frame gets larger, not to mention it is in the 3 inch range plus they list reach separately anyway. They have letters to bullet relevant dimensions then make no reference to the bullets or the nomenclature of them when giving the explicit dimensions.

tlg · Aug 30, 2023

Lombard said:
The only thing on that chart that could possibly be used to determine frame size is the STACK measurement.

Size is just an arbitrary number manufacturers make up.
If you want to know what size it is, you measure the frame and compare it to the chart.
It's always that way unless the frame is labeled.
You've seriously never measured a frame?

Help identifying our bike

Jgross1966

tlg

Jgross1966

Jgross1966

Lombard

Jgross1966

Lombard

Jgross1966

tlg

duriel

duriel

tlg

cxwrench

Lombard

Lombard

tlg

Lombard

cxwrench

craiger_ny

tlg

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