Brompton handlebar Stem Question
 

So I have an opportunity to acquire a Brompton.. only thing is it has the M style bars.
I really want S style. If I put a mid rise bar like the Joseph Kousac one will that screw my geometry or is this a good solution without investing in a new stem.. Any opinions / experience / Tips ?? Oh it's a 2016 model.. ( I am not worried about adjusting cable lengths I have a fully equipped work bench..)

Thanks gang..

Steering geometry remains unchanged.. 72.4 for all
see chart. (Pre 2017) for bar height and the bend offset


https://cimg0.ibsrv.net/gimg/bikefor...d63cdabda5.png

Hmm yep but looking at that graphic the S stem results in a 31 mm longer virtual top tube... I guess setting the saddle back a bit could compensate... I wish I could find a real Geo chart for the Brompton. I might have to be the guinea pig on this one..

a few simple tools: angle finder @ builders supply & double scale tape- measure & you can DIY the info..

I've had 2 M3 R & L. green one is current ..
http://www.cyclofiend.com/working/im...-1IMGP0010.jpg

https://cimg9.ibsrv.net/gimg/bikefor...93c364ee14.png

"a few simple tools: angle finder @ builders supply & double scale tape- measure & you can DIY the info.."

Er yeah but you have to have a Brompton to take the measurements from... If I had a Brompton I would not be asking about GEO on this forum,,,

I have not done this but you may need to change cable lengths. I changed an M to H and had to get new cables. I have heard that you won't need to do this online but cables are fussy when it comes to folding.

This is quite a popular application for Joseph Kuosac mid riser bar on Bromptons.

You got to keep the cables unchaged (can be a little bit longer for the perfectionist), a lower riding postion (might not be as low as S type) and a very large handlebar (can be 600mm fulll length uncut) for cockpit.

BTW, Joseph Kuosac also has carbon midriser handlebar and the soon to be released carbon ergonomic S handlebar too

This one is from older M to mid-riser Joseph Kuosac uncut

https://cimg8.ibsrv.net/gimg/bikefor...f48645123d.jpg

Thanks thats exactly what I wanted to know.. I actually did a little guesstimating using the published bar heights and it looks like using a 60mm rise bar.. like a BMX bar would put me right at the same height as the S.. just with the shorter virtual TT

you could fit a syntace bar adaptor like dahons and terns. it would allow you some extension and rotational tuning
https://www.syntace.com/en_GB/produc....4-clamps?c=79

or a litepro copy

it makes sense as you went for something longer and you needed to restore clearances/play for the cable to fold

Solved
 

I found these videos on YouTube that have the measurements.. so can work from there..

https://www.youtube.com/c/Bikesandli...y=measurements

You got some oddly complex answers to your simple question. No there won't be a massive change, the bars will just be a bit lower.