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Old 04-15-18, 05:46 AM   #1
chmac
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Brompton: How can I widen the rear wheels to stop the bike falling over?

My Brompton spends a lot of time with the back wheel flipped under the frame. I have the rear rack. It's not very stable in this position. I noticed that one of the rear wheels on the rack (rear when the bike is riding) is fitted on the inside of the rack. I swapped it to the outside, to make the wheels a little wider.

I'd like to make that set of wheels even wider. Maybe an extra 10cm at each side. Width at the back of the rear rack won't interfere with my feet when pedalling, and could make the bike very stable when standing. But I can't find anything on the internet about making this modification. I've searched a few times over a year or so.

Any advice? Anyone else tried this? Is it obviously a stupid idea for a reason that I've failed to grasp? :-)
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Old 04-15-18, 06:16 AM   #2
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Originally Posted by chmac View Post
My Brompton spends a lot of time with the back wheel flipped under the frame. I have the rear rack. It's not very stable in this position. I noticed that one of the rear wheels on the rack (rear when the bike is riding) is fitted on the inside of the rack. I swapped it to the outside, to make the wheels a little wider.

I'd like to make that set of wheels even wider. Maybe an extra 10cm at each side. Width at the back of the rear rack won't interfere with my feet when pedalling, and could make the bike very stable when standing. But I can't find anything on the internet about making this modification. I've searched a few times over a year or so.

Any advice? Anyone else tried this? Is it obviously a stupid idea for a reason that I've failed to grasp? :-)
10cm or 10mm? 10cm sounds like a Brompton fatbike or water bike. Below's a Brompton with thicker wheels and tyres by the looks of it.




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Old 04-15-18, 08:08 AM   #3
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Make sure the wheels are on the outside of the rack..I have seen some where they are fitted on the inside of the rack on the supporting members that stick out from the rack..You could simply put a longer bolt on the right hand of the rear rack ..say half an inch longer and fix the wheel on there..The Brompton tends to fall over on that side with a rack because it is a bit lopsided when folded..This doesn't tend to happen when there is no rack fitted..

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Old 04-15-18, 08:12 AM   #4
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The left rear rack wheel is fitted on the inside of the rack to keep its depth dimension shallower, and perhaps to protect the wheel - for example when folded and lying on its side. If you don't mind an increase in the depth dimension, then sure you can flip the wheel to the outside to match right rear wheel. You could also use longer bolts and spacers on both sides to widen the track.

There's also the X-roller mod for front wheels, but only increases track on the right side, and was really only intended for stability during shopping cart mode, and parked while folded. It will still fall over in one direction in kickstand mode.
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Old 04-15-18, 08:27 AM   #5
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After market, made for B's in Asia, (not By the company in UK), there es a piece replacing the 2 rear frame wheels ,

and one wheel pulls out wider temporarily ,on a telescoping shaft.. making it wider..
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Old 04-16-18, 10:19 AM   #6
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After market, made for B's in Asia, (not By the company in UK), there es a piece replacing the 2 rear frame wheels ,

and one wheel pulls out wider temporarily ,on a telescoping shaft.. making it wider..
not cheap - about 65 plus the cost of wheels - made in the Far East, so add carriage, (sometimes) and if you are unlucky import duties

I'm trying to find a good lightweight kickstand - but all stuff for Brompton's is not cheap and the best I can find is 65

Multiply UK 's x 1.5 = US $'s approximately
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Old 04-17-18, 05:06 AM   #7
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not cheap - about 65 plus the cost of wheels - made in the Far East, so add carriage, (sometimes) and if you are unlucky import duties

I'm trying to find a good lightweight kickstand - but all stuff for Brompton's is not cheap and the best I can find is 65

Multiply UK 's x 1.5 = US $'s approximately
Did you look at the different forums to see if anybody did a DIY solution to the problem?
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Old 04-17-18, 05:09 AM   #8
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Did you look at the different forums to see if anybody did a DIY solution to the problem?
Yep I have, not only for a rack but also for a good, lightweight kickstand

but you don't want to put anything "cheap looking" on a Brompton!!

The Brompton rack seem the best value out there at 80

Last edited by BillN33; 04-17-18 at 05:13 AM.
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Old 04-17-18, 05:29 AM   #9
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Yep I have, not only for a rack but also for a good, lightweight kickstand

but you don't want to put anything "cheap looking" on a Brompton!!

The Brompton rack seem the best value out there at 80
For sure

I am in the process of buying a rack myself but I am thinking about getting a after market one that somebody here has used for some time.

There has been some talk about the "no rack no fender" B`s (are they called E?) falling over and some gadget to put between the hook and the rear stay to lift the front axel a bit up when folded. Not sure if this makes a difference with the bikes with rack and fender. You could look into it, like cutting open a 1" piece of the rubberhose used in car cooling systems or similar and hook it over the stay under the hook. If it works better than without you could make or buy something less crappy looking for long term use. I think I remember you can buy a "fatter" plastic hook or a plastic or alu piece to atatch to the rear stay. Not super expensive the last time i looked.
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Old 04-17-18, 05:53 AM   #10
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For sure

I am in the process of buying a rack myself but I am thinking about getting a after market one that somebody here has used for some time.

There has been some talk about the "no rack no fender" B`s (are they called E?) falling over and some gadget to put between the hook and the rear stay to lift the front axel a bit up when folded. Not sure if this makes a difference with the bikes with rack and fender. You could look into it, like cutting open a 1" piece of the rubberhose used in car cooling systems or similar and hook it over the stay under the hook. If it works better than without you could make or buy something less crappy looking for long term use. I think I remember you can buy a "fatter" plastic hook or a plastic or alu piece to atatch to the rear stay. Not super expensive the last time i looked.
I'm not a fan of always flipping the rear wheel under ...... so I have been looking for a lightweight kickstand - there are 2 specific "for" Brompton ones available - one at 65 and the other at 100+...... both ex Singapore/Taiwan

I keep searching Ebay for a kickstand for a 16" Bike - lightweight and fixing to the drop out - but I have not found a suitable one...... kickstands on eBay are cheap, (under 10), but it is finding the right one

There is a rack on Ebay at the moment - made in the Far East - no fender needed - but it is still approaching 90 once you add wheels and more if you add 4 wheels

https://www.ebay.co.uk/itm/BROMPTON-...53.m1438.l2649

Last edited by BillN33; 04-17-18 at 05:56 AM.
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Old 04-17-18, 07:30 AM   #11
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Greenfield rear mount kickstand is superior to the lighter kickstands for stability. However, there is an interference with the stock pump. I changed pumps to a lezyne stored in the seatpost.

Last edited by Schwinnsta; 04-17-18 at 07:31 AM. Reason: format
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Old 04-17-18, 08:30 AM   #12
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Greenfield rear mount kickstand is superior to the lighter kickstands for stability. However, there is an interference with the stock pump. I changed pumps to a lezyne stored in the seatpost.
Greenfield rear mount kickstand is superior to the lighter kickstands for stability. However, there is an interference with the stock pump. I changed pumps to a lezyne stored in the seatpost.[/QUOTE]

Thanks I saw that - I think that there are sometimes available on eBay in the UK - but as you say there is the pump problem and it's not the most attractive

This is the one that is sometimes on eBay in the UK - the seller must import them - 65 - made in Japan


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Old 04-17-18, 08:55 AM   #13
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Greenfield rear mount kickstand is superior to the lighter kickstands for stability. However, there is an interference with the stock pump. I changed pumps to a lezyne stored in the seatpost.
These are less stable. You are better off kicking the wheel under and buying the Greenfield and the Lezyne pump both is less money. You end up with a better kickstand and better pump but some additional weight. The kickstand weighs twice as much.


Thanks I saw that - I think that there are sometimes available on eBay in the UK - but as you say there is the pump problem and it's not the most attractive

This is the one that is sometimes on eBay in the UK - the seller must import them - 65 - made in Japan


[/QUOTE]
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Old 04-17-18, 11:20 AM   #14
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I keep searching Ebay for a kickstand for a 16" Bike - lightweight and fixing to the drop out - but I have not found a suitable one...... kickstands on eBay are cheap, (under 10), but it is finding the right one
This is my Brompton with a cheap on-axle Evo kickstand for 16" off Ebay



I have since moved on to expensive ones, but this one worked fine as long as you did not overload the front bag. I tried some that mounted on the chainstay but it was difficult to prevent them from rotating around the round chainstay and I gave up.
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