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Handle bar + stem impacting reach distance

Posted: Mon Dec 03, 2018 5:38 pm
by survivor
Hi,

I am currently on a 100mm -6 degree stem with 79mm reach handlebar. Considering to change to an integrated handlebar/stem option. If the integrated handlebar has a reach of 69mm and its stem is -8 degree, should I get a 100mm, 110mm or 120mm length option? The handlebar reach difference is 10mm, to compensate it looks like I need to go 110mm lengh? Appreciate any advice given on this situation. Thanks!

Re: Handle bar + stem impacting reach distance

Posted: Mon Dec 03, 2018 7:59 pm
by wheelsONfire
I think you answered your own question!
Going for spec, it is 110mm

Re: Handle bar + stem impacting reach distance

Posted: Mon Dec 03, 2018 7:59 pm
by Weenie

Re: Handle bar + stem impacting reach distance

Posted: Mon Dec 03, 2018 11:31 pm
by survivor
wheelsONfire wrote:
Mon Dec 03, 2018 7:59 pm
I think you answered your own question!
Going for spec, it is 110mm
:D I am just not sure whether the 2 degree would make any difference on the length choice.

Re: Handle bar + stem impacting reach distance

Posted: Tue Dec 04, 2018 12:08 am
by Catagory6
survivor wrote:
Mon Dec 03, 2018 11:31 pm
wheelsONfire wrote:
Mon Dec 03, 2018 7:59 pm
I think you answered your own question!
Going for spec, it is 110mm
:D I am just not sure whether the 2 degree would make any difference on the length choice.
i was looking at a chart that graphed out this exact issue the other day.
let me scan through my history

in the meantime:
https://www.google.com/search?q=bike+st ... 52&bih=999

Re: Handle bar + stem impacting reach distance

Posted: Tue Dec 04, 2018 12:24 am
by sfo423
Assuming a 73d HT, 100, -6 stem would give you 38mm rise and 92mm reach (to add to frame S&R). With the same HTA, a 100 -8 stem would give you 35mm & 93mm respectively.

I'd call that pretty much a no change unless you are getting paid large sums to ride.

OTOH, going to a 110 -8 would be + 36mm & 103mm.

Re: Handle bar + stem impacting reach distance

Posted: Tue Dec 04, 2018 9:27 am
by Marin

Re: Handle bar + stem impacting reach distance

Posted: Tue Dec 04, 2018 10:17 pm
by survivor
sfo423 wrote:
Tue Dec 04, 2018 12:24 am
Assuming a 73d HT, 100, -6 stem would give you 38mm rise and 92mm reach (to add to frame S&R). With the same HTA, a 100 -8 stem would give you 35mm & 93mm respectively.

I'd call that pretty much a no change unless you are getting paid large sums to ride.

OTOH, going to a 110 -8 would be + 36mm & 103mm.
Where is the handlebar reach comes into play in this calculations?

Re: Handle bar + stem impacting reach distance

Posted: Tue Dec 04, 2018 10:18 pm
by survivor
Marin wrote:
Tue Dec 04, 2018 9:27 am
http://yojimg.net/bike/web_tools/stem.php

Stem comparison tool
I found this the other day. So is the Total Reach = Stem Length + Handlebar Reach? This is the part that is not clear to me, and how the stem angle plays into the total reach calculations.

Re: Handle bar + stem impacting reach distance

Posted: Wed Dec 05, 2018 12:00 am
by AJS914
I've never seen a "total reach calculation". I think you are at the point where you just need to make an educated guess.

First, if you go from a 10cm to an 11cm stem, the tops of your bars will be 1cm farther away. Is that ok? If not, then stick with the 10cm stem.

Second, if you think it's ok to increase the reach of the tops of the bars and you like your current lever reach then go for the 11cm stem on these new shorter reach bars. Your levers should remain in roughly the same position.

The reach to the levers is also influenced by how high or low you mount the levers and the shape of the bend on the bars. Like I said, at this point you just need to make an educated guess. In the end it's only 1cm either way. You'll probably get used to whatever you do.

Re: Handle bar + stem impacting reach distance

Posted: Wed Dec 05, 2018 12:07 am
by IchDien
Yes.

For example I run the 3T ergosum (89mm reach) on a 130mm -6 degree stem set up.

That means potentially I would have to run a 140mm stem with a shorter bar reach, or 150mm with even shorter. etc.

If the bar reach was more, for example the 3t aeronova bars (104mm reach) I'd have to run a 110-120mm stem. etc.

The stem angle does come into play too, use the calculator to see.

However, as the above poster mentions, it is all about making an educated guess because bar angle and hood placement is very different for most people.

Re: Handle bar + stem impacting reach distance

Posted: Wed Dec 05, 2018 12:07 am
by Weenie

Re: Handle bar + stem impacting reach distance

Posted: Wed Dec 05, 2018 1:28 am
by sfo423
Smply plug the 100 -8 stem and 100 -6 stem calcs to your existing bikes stack and reach so you can see the different touch point.

As mentioned, there is only 3mm change to rise and 1mm change to reach. Its really n/a.


survivor wrote:
Tue Dec 04, 2018 10:17 pm
sfo423 wrote:
Tue Dec 04, 2018 12:24 am
Assuming a 73d HT, 100, -6 stem would give you 38mm rise and 92mm reach (to add to frame S&R). With the same HTA, a 100 -8 stem would give you 35mm & 93mm respectively.

I'd call that pretty much a no change unless you are getting paid large sums to ride.

OTOH, going to a 110 -8 would be + 36mm & 103mm.
Where is the handlebar reach comes into play in this calculations?