Advice on size please ? Giant Propel Advanced 2017

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bilabonic
Posts: 215
Joined: Sun Feb 15, 2009 21:24 pm

Advice on size please ? Giant Propel Advanced 2017

Postby bilabonic » Thu May 30, 2019 05:54 am

Hi All

Hi guys,

Looking to purchase a Giant Propel Advance 2017 (delivered so can not test run). Medium ST=52cm, Stack=55.3cm

I'm 5'8" and 31.5 inside leg. (wear a 32" reg jeans..lol)

I have not had a road bike for a few years and then simply went on seat tube length, i was always 54cm.

These new aero bikes have a new geometry and use stack height (which comes in as bigger)..

I was confused by this as as i was chatting to a mate with a had a Cube Agree and he stated it was Large, so i asked him to measure the tube length and it was 52cm!! He sent me a pic of this and it had 56cm written on it??

Looking at the chart below i am on the edge of S or M..

https://www.giant-bicycles.com/int/prop ... ced-0-2017

Has anyone got one to hand or one with similar geometry to comment

Cheers
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philthy3
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Re: Advice on size please ? Giant Propel Advanced 2017

Postby philthy3 » Thu May 30, 2019 07:28 am

If you're between sizes, go for the smaller size and adapt with stem lengths and set back.
We're all buffoons; some slightly less than others.

-Dash
Posts: 172
Joined: Mon Nov 14, 2016 12:55 pm

Re: Advice on size please ? Giant Propel Advanced 2017

Postby -Dash » Thu May 30, 2019 10:34 am

Yep. Older Cube sizing was silly. 56cm more like a 52cm from any other brand. I wouldn't call the 56cm Cube Agree a "Large" though, there are far bigger Cubes available. Think they go up to "62".

Any Giant stores near you? They usually have a demo fleet, the current Propel would be very similar geometry.

Matt_N
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Re: Advice on size please ? Giant Propel Advanced 2017

Postby Matt_N » Thu May 30, 2019 16:46 pm

Cube are a bit weird but when you grasp it it’s quite simple, they are sloping frames but size by virtual seat tube as if it were a horizontal top tube; centre B.B. to virtual top of seat tube.

Their Large or 56cm means 56cm effective seat tube length, which is actually 52cm and has a 56cm ctc top tube. Their sizing is actually very similar to Colnago but does take some thought.

With Giant I find I’m between sizes M and M/L.
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NitrousOxide
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Re: Advice on size please ? Giant Propel Advanced 2017

Postby NitrousOxide » Thu May 30, 2019 17:22 pm

I'm 178cm tall and cycling inseam of ~83cm, my Cube is a 58cm frame with a 54cm seat tube. Stack 610mm and reach 388mm.
https://www.cube.eu/uk/products/road-ra ... hred-2016/

If I was buying a Propel, going on stack/reach, I would be either M or ML. Given a Propel is all about aero, M with a +10mm stem would be better, if my back could cope. It would also give fractionally more seat post, on my Cube I use ~73cm BB to saddle top.
================
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zefs
Posts: 464
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Re: Advice on size please ? Giant Propel Advanced 2017

Postby zefs » Thu May 30, 2019 18:55 pm

You can ride both, the S has smaller cranks which would be more suitable for your inseam. Then the M has 2cm bigger stack which would be a better choice if you are not flexible enough and need a higher position (although you could use spacers on S size, too if needed) but I am guessing that's not an issue since you are going for an aero bike.

-Dash
Posts: 172
Joined: Mon Nov 14, 2016 12:55 pm

Re: Advice on size please ? Giant Propel Advanced 2017

Postby -Dash » Thu May 30, 2019 22:18 pm

[quote="zefs"] cranks which would be more suitable for your inseam.
I'm curious about this. Can you elaborate?

Shirley Basso
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Joined: Thu Nov 16, 2017 09:39 am

Re: Advice on size please ? Giant Propel Advanced 2017

Postby Shirley Basso » Thu May 30, 2019 22:23 pm

Effective Top Tube and Head Tube has always been a more effective measurement for me. About 57cm and 16cm respectively and I am 6ft on the nose and 32in inseam.

Generally speaking the company size guides work well if you have normal proportions. Giant are pretty well represented through their dealer network - can't you sit on one?

sithebike
Posts: 190
Joined: Tue Mar 06, 2007 20:28 pm

Re: Advice on size please ? Giant Propel Advanced 2017

Postby sithebike » Thu May 30, 2019 22:29 pm

I am 5ft 8 and ride a small Propel advance.

Hopefully that helps.

zefs
Posts: 464
Joined: Sun Dec 20, 2015 12:54 pm

Re: Advice on size please ? Giant Propel Advanced 2017

Postby zefs » Fri May 31, 2019 05:45 am

-Dash wrote:I'm curious about this. Can you elaborate?


170mm cranks of the S Propel are a better choice bio mechanically for his inseam than 172.5mm
It might be a detail but it makes a difference on pedaling motion.

-Dash
Posts: 172
Joined: Mon Nov 14, 2016 12:55 pm

Re: Advice on size please ? Giant Propel Advanced 2017

Postby -Dash » Fri May 31, 2019 12:44 pm

zefs wrote:
-Dash wrote:I'm curious about this. Can you elaborate?


170mm cranks of the S Propel are a better choice bio mechanically for his inseam than 172.5mm
It might be a detail but it makes a difference on pedaling motion.

Do you have a source for this? Genuinely interested. My inseam is shorter and I run 172.5.

zefs
Posts: 464
Joined: Sun Dec 20, 2015 12:54 pm

Re: Advice on size please ? Giant Propel Advanced 2017

Postby zefs » Fri May 31, 2019 13:23 pm

-Dash wrote:
zefs wrote:
-Dash wrote:I'm curious about this. Can you elaborate?


170mm cranks of the S Propel are a better choice bio mechanically for his inseam than 172.5mm
It might be a detail but it makes a difference on pedaling motion.

Do you have a source for this? Genuinely interested. My inseam is shorter and I run 172.5.


https://bikedynamics.co.uk/FitGuidecranks.htm

You can run different size cranks because it doesn't only depend on inseam but also leg proportions, flexibility etc. but yeah all those parameters are only of interest if your saddle position/fit is correct so don't want to get too off topic.
I have tried 165 to 175 crank lengths and I think the guidelines on the link above are correct (for my inseam atleast) regarding pedaling motion/feel.

Power wise shouldn't matter much, but I think having the correct size helps with the overall feel so pedaling motion would be smoother.


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