Frame with 72deg seat tube angle and short stack/reach

Discuss light weight issues concerning road bikes & parts.
zefs
Posts: 352
Joined: Sat Aug 05, 2017 8:40 pm

by zefs

Yeah, it's weird...about the pedalling motion, I think it's related to hip angle since it's closing as you sit further back (that is why you also need to go up as you go back). Another reason that makes me think I need more setback is hamstrings/glutes are not working unless I sit on the position I mentioned (3-5cm back) and only quads get soar but that kind of setback would require custom geometry since it's ~1cm of setback per degree.

reedplayer
Posts: 456
Joined: Sat Nov 14, 2015 10:10 am

by reedplayer

ridley helium L, 575 stack, 390 reach, sa 73°

by Weenie


none
Posts: 115
Joined: Mon Dec 17, 2018 11:29 pm

by none

AFAIK, the further setback you have from B/B, the lower the seat height.
Maybe you slide forward because your seat height is too long?
Maybe try tilting the saddle nose up to prevent sliding forward, it may not look pleasant, but it would function properly, and much easier adjustment than having a custom frame built with 72 sa.

jih
Posts: 242
Joined: Fri Jan 29, 2016 12:54 pm

by jih

Why not get a seatpost with the most setback that you can find? That’ll give you the same position as a really slack seattube angle, but for much cheaper to try it out until you know exactly what position you need.

Velo Orange do a seatpost with a ton of setback. Probably there are others too.

mattr
Posts: 4557
Joined: Fri May 25, 2007 6:43 pm
Location: The Grim North.

by mattr

Why not get a proper fit?

Zakalwe
Posts: 549
Joined: Sun Jun 17, 2012 3:15 pm

by Zakalwe

zefs wrote:
Sun Dec 30, 2018 11:31 am
I think it's related to hip angle since it's closing as you sit further back (that is why you also need to go up as you go back)
Yeah, that’s not right. No one does this.

bikeboy1tr
Posts: 343
Joined: Thu Mar 21, 2013 3:19 am
Location: Southern Ontario Canada

by bikeboy1tr

mattr wrote:Why not get a proper fit?
Oh oh not one of many bike fit threads again. I was trying to search out the title of one thread, think it was, Not wasting more money on a another bike fit. Lots of great information there.

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"Life is like riding a bicycle. To keep your balance you must keep moving"-Albert Einstein
2018 Colnago V2R Rim Brake
2014 Norco Threshold Disc Brake
2012 Time RXRS Ulteam Rim Brake
2008 Time VXR Rim Brake
2006 Ridley Crosswind Rim Brake

mattr
Posts: 4557
Joined: Fri May 25, 2007 6:43 pm
Location: The Grim North.

by mattr

Yeah. It gets painful after the 25th time.

https://weightweenies.starbike.com/foru ... 3&t=154329

That the most recent bike fit thread.

zefs
Posts: 352
Joined: Sat Aug 05, 2017 8:40 pm

by zefs

Where do you guys place the sit bones in the saddle based on the image I posted? And do you move from that spot when doing intervals for example?
Last edited by zefs on Sun Dec 30, 2018 4:46 pm, edited 1 time in total.

bikeboy1tr
Posts: 343
Joined: Thu Mar 21, 2013 3:19 am
Location: Southern Ontario Canada

by bikeboy1tr

That's the thread @ mattr I got educated on a couple things there.

Sent from my STH100-1 using Tapatalk



"Life is like riding a bicycle. To keep your balance you must keep moving"-Albert Einstein
2018 Colnago V2R Rim Brake
2014 Norco Threshold Disc Brake
2012 Time RXRS Ulteam Rim Brake
2008 Time VXR Rim Brake
2006 Ridley Crosswind Rim Brake

zefs
Posts: 352
Joined: Sat Aug 05, 2017 8:40 pm

by zefs

Not a big deal, will test the new stem as well as saddle width and come to a conclusion.
Have a great new year everyone! :beerchug:

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