Frame size, new bike fitting, questions

Discuss light weight issues concerning road bikes & parts.
NordicSal
Posts: 75
Joined: Thu Feb 14, 2019 11:09 pm

by NordicSal

I am around 197 cm with around 100 cm inseam, very long arms as well and pretty flexible on a bike at least. Is there any chance I would ever fit on a 58 cm bike, do they make seatposts long enough? Right now I am on a Domane ALR 62 cm, and I have this theory that a more racy geometry will mean a higher positioned seattube, and therefore I might be able to cope with a size or two smaller?
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Skærmbillede 2019-03-03 kl. 00.35.43.png

by Weenie


icantaffordcycling
Posts: 427
Joined: Wed Jan 09, 2019 5:03 am

by icantaffordcycling

Hey guys!
I need some help with my bike fit. I have lots of space to play with at the moment (130mm stem so options to go longer or shorter, the video shows my position slammed with 35mm above the stem, lots of seat-post and can cut a lot more if needed). I recently tried slamming my stem and seeing how my position on the bike would change. Everything looks and feels fine on the tops with my elbows bent to 90* but the problems show up when I get into my drops and try to bend my elbows. I think I am too fat / my cranks are too long to get that low but I am not sure what to do. Do I have to move my bars back up and are there any other red flags with my fit?
Position on the tops.
Position in the drops.
Specialized Allez Sprint
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zefs
Posts: 438
Joined: Sat Aug 05, 2017 8:40 pm

by zefs

To me it looks like you are trying to force a too aggressive aero position, even more so than a TT bike. Your saddle seems a bit too low (and too forward) and I can see some restriction on the hip motion due to that and the very low handlebar position. Would recommend a professional bike fit since you seem to be aiming for racing/competition but the position is off.

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silvalis
Posts: 699
Joined: Mon Sep 07, 2015 1:02 am
Location: Aus

by silvalis

Yep, looks like you toe pedal a bit so you aren't getting as much knee extension. No idea if this is due to you trying to get super low and aero and your hammys are saying no. Your pedalling might be completely different when you're sitting up on the hoods.

Anyway, if its not your hammys, zefs suggestion is good. Your arched back in the drops is a reasonable indication that you're cramped up too much.
Chasse patate

addictR1
Posts: 1758
Joined: Sun Jun 10, 2012 1:11 am

by addictR1

hi all... i'm trying to figure out the proper frame size. currently riding a 51cm Scott Addict R1 and 48cm BMC TMR02; both using 170mm cranks. i've always felt stretched out and felt ok but not 100% comfy. i've been to a PFit fitter in SF and turned out with a knee injury 1.5wks into riding that left me off the bike for close to 2 months.

anyways.. long story short, i tried wrenchscience bike fit and pedalforce bike fit. can't believe based on the measurements, my bikes are too big for me. is this pretty accurate or should i get a retul bike fit for a new frame? thinking of going Ti for a keeper, so want to get it as dialed in as possible.

any recommendations on where to get fitted or measured would be greatly appreciated. i'm in santa clara county area in california. thanks.
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Bike Fit 2.JPG
Pedalforce Bike Fit - Recommend.JPG

zefs
Posts: 438
Joined: Sat Aug 05, 2017 8:40 pm

by zefs

Bike sizing seems correct for your measurements (only checked the bmc). You might wanna try 165mm cranks as you have short legs for your height. Not sure about your reach without seeing you on the bike, have you tried a shorter stem?

addictR1
Posts: 1758
Joined: Sun Jun 10, 2012 1:11 am

by addictR1

zefs wrote:Bike sizing seems correct for your measurements (only checked the bmc). You might wanna try 165mm cranks as you have short legs for your height. Not sure about your reach without seeing you on the bike, have you tried a shorter stem?
Well I first started with a 85mm stem and 90mm but both of those I couldn’t slam that stem. Then I went to the fitter and he suggested 100mm and got one that is -17 degree so it’s slammed.

Maybe I should get a 80-90 version in -17?


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zefs
Posts: 438
Joined: Sat Aug 05, 2017 8:40 pm

by zefs

Not sure without seeing your position, but you can can use this website to see the difference when switching between stems:
http://yojimg.net/bike/web_tools/stem.php

If you can't reach the brake levers comfortably maybe that is causing your issue? just a suggestion as they are adjustable.

addictR1
Posts: 1758
Joined: Sun Jun 10, 2012 1:11 am

by addictR1

zefs wrote:Not sure without seeing your position, but you can can use this website to see the difference when switching between stems:
http://yojimg.net/bike/web_tools/stem.php

If you can't reach the brake levers comfortably maybe that is causing your issue? just a suggestion as they are adjustable.
Thanks for the link. I’ll play with that and see. Right now I can reach my brakes in the drops, but my arms are somewhat straight if I want to remain my sitbone planted.


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silvalis
Posts: 699
Joined: Mon Sep 07, 2015 1:02 am
Location: Aus

by silvalis

addictR1 wrote:
Sun May 26, 2019 9:02 pm
Thanks for the link. I’ll play with that and see. Right now I can reach my brakes in the drops, but my arms are somewhat straight if I want to remain my sitbone planted.
Does "remain my sitbone planted" mean you're trying not to rotate your pelvis in order to reach the drops?

addictR1 wrote:
Sun May 26, 2019 5:09 pm
Well I first started with a 85mm stem and 90mm but both of those I couldn’t slam that stem. Then I went to the fitter and he suggested 100mm and got one that is -17 degree so it’s slammed.

Maybe I should get a 80-90 version in -17?
Hang on, so you feel too stretched out but went longer and lower?
Chasse patate

zefs
Posts: 438
Joined: Sat Aug 05, 2017 8:40 pm

by zefs

That probably means you are a bit low/long and you are straightening your hands to try and push your pelvis back to feel the sitbones (to alleviate pressure in the perineum). Same thing can happen in the hoods, straight arms means you are not comfortable/relaxed in the saddle area.

It can also be related to short reach but probably not the case here.

addictR1
Posts: 1758
Joined: Sun Jun 10, 2012 1:11 am

by addictR1

silvalis wrote:
addictR1 wrote:
Sun May 26, 2019 9:02 pm
Thanks for the link. I’ll play with that and see. Right now I can reach my brakes in the drops, but my arms are somewhat straight if I want to remain my sitbone planted.
Does "remain my sitbone planted" mean you're trying not to rotate your pelvis in order to reach the drops?

addictR1 wrote:
Sun May 26, 2019 5:09 pm
Well I first started with a 85mm stem and 90mm but both of those I couldn’t slam that stem. Then I went to the fitter and he suggested 100mm and got one that is -17 degree so it’s slammed.

Maybe I should get a 80-90 version in -17?
Hang on, so you feel too stretched out but went longer and lower?
By not having to slide forward in my saddle.
I feel stretched out with the 100mm stem that was recommended to me by the fitter. Originally I had a 90mm which I’m gonna go back to.


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silvalis
Posts: 699
Joined: Mon Sep 07, 2015 1:02 am
Location: Aus

by silvalis

Interesting sliding forward to get bent arms in the drops. Your drops have a shorter reach than your hoods so I would have guessed you'd slide backwards. Arching your back maybe?
Chasse patate

addictR1
Posts: 1758
Joined: Sun Jun 10, 2012 1:11 am

by addictR1

silvalis wrote:Interesting sliding forward to get bent arms in the drops. Your drops have a shorter reach than your hoods so I would have guessed you'd slide backwards. Arching your back maybe?
Yea I have really bad posture and form. Slouch very often it’s like a norm. Need to find some exercise that can fix my slouching and weak core.

Btw, any recommendations on fitters in the Bay Area, Cali?

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by Weenie


jadedaid
Posts: 9
Joined: Fri Feb 22, 2019 7:43 pm

by jadedaid

Hi everyone,

I'm in the fortunate position to be getting a custom frame. I have lanky proportions (i.e. long legs and no torso) which means I have to ride short stems on regular bikes. I have a 56cm Great Divide from No.22 on a 90mm stem and it sometimes feels like I'm piloting a boat that's in front of me, rather than a bike that I am 'inside' of. This is one of the reasons I am looking at replacing the frame.

Going forward, I have the choice of either building the frame around a 100mm stem (55cm top tube on a 73d seatube with my beloved 3T bar) or 110mm stem (54.5cm top tube on a 73d seatube, using a bar with a shorter reach). The sketch which came back from the builders put me on a 100m stem and 55cm top tube, the concern with going shorter was down to toe overlap going from Small Annoyance to Big Annoyance.

Any advice from you folks as to which way you would go if in the same boat?

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