What size Brompton seat posts are you guys using?

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cheys03

Veteran
For 1/4", approx 6-7mm you might find a saddle with rails/cushion height that give you the extra.
Advantage being you'd have the post set the the right height every time just by pulling out to max.
 

chriscross1966

Über Member
Location
Swindon
5'9, a Carbon fibre one cut to be halfway between the standard and the long one.
 

Kell

Veteran
I hired a Brompton with the telescopic and thought it was brilliant.

I ended up buying one with the extended post as i didn't need the full extension of the telescopic one but it does become surprisingly useful.

Because it consists of essentially two seat posts, you can set the one that actually goes in the bike at full extension. Then use the smaller one to set the seat height correctly for you.

Then you leave that one alone.

When folding/unfolding the bike this means the seat is always at the correct height when you get on.

I know they now have a plastic shim that means you can do this too, but that's a faff to set up IMO.

It also means that the bike folds up ever so slightly smaller.

I put my Brompton in the back of our convertible Mini daily and the hired one with the telescopic post fitted in better than the one I bought with the extended post. It's not a huge problem, but I think I would get the telescopic one if buying again - just for ease of use.

I'm just over 5' 11" btw.
 

12boy

Guru
Location
Casper WY USA
I too am a towering 5'8''. I go with 34.5 inches from pedal surface to seat top and have at least an inch of seat post left unused. In pictures of Bromptons it seems the seat is as far forward as possible.Does anyone have insight into the ergonomics of having the seat forward or back? I have S bars and like mine about medium but I am just guessing as to what is most efficient.
 

reppans

Active Member
I'm using Gorilla tape for my seat height shim - free and you don't even need to remove the seat. Gorilla tape glue also seems much more resistant to becoming cement residue, like duct tape, when you want to remove it.

Forward/back seat alignment should be set using the knee-plumb-line-to-crank method, but some might shift that bit forward for a smaller fold.
 

e-rider

crappy member
Location
South West
6'1: the long one but not telescopic.
so give or take 1cm you are my height - I have average length legs for my height. Would you say that you have enough length in the extended post or are you riding with it at the max? Brompton say up to 6'2" for the extended but many people that height claim it's not long enough

How much bend is in your knees?
 

CopperBrompton

Bicycle: a means of transport between cake-stops
Location
London
Does anyone have insight into the ergonomics of having the seat forward or back? I have S bars and like mine about medium but I am just guessing as to what is most efficient.
I find it doesn't make a huge difference. Mine was fully-forward when I got it, and I've recently had to set it fully-back to accommodate a seat-rail GoPro mount. The new riding position is marginally sportier, but felt completely normal within a matter of minutes.
 

Kell

Veteran
My biggest bugbear with Brommies is that they're so short.

I put my seat as far back as it would go and even flipped the pentaclip as it gives a little bit extra.
 
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12boy

Guru
Location
Casper WY USA
You might try an Aber Hallo which allows you to extend your reach with the handlebars a couple of inches.Use one with a QR on the handle post and you can rotate to avoid folding problems.
 
No, a rearward extension. It allows the saddle to be set either fore or aft of the seat post. In my case it moves the saddle back.

Apols for the poor photo but ....

View attachment 120574
Where can I get one of those, please? And do they come in different diameters? I really need something like this for my two vintage bikes (with straight posts - I've forgotten the diameter but can find it) with very slack seat tube angles. My knees would be really grateful!

Sorry for thread hijack. :rolleyes:
 
Does anyone have insight into the ergonomics of having the seat forward or back?
This is a matter of bike fit, determined by a number of factors (none of which are reach to the handlebars) including the length of your feet and proportions of your legs, in particular the length of your femur. The fore/aft position of your saddle will determine the relative position of your hips to your pedal spindle, and from there all the angles of your legs (bent at ankle, knee and hip, each angle working as levers).

This is of course very simplified. If you have serious concerns about your set up, get a bike fit (by a trained professional) or an assessment by a physiotherapist who specialises in cycling.

ETA: Oops, thread hijack again! Seems endemic on this thread...
 

Pottsy

...
Location
SW London
5'9" height / 29.5" inside leg / standard seat post just under maximum height.

I use one of those clever plastic inserts which restricts the height to the exact level I need it (so I just lift it too full extension).
 
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