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Old 06-27-13, 09:07 AM   #1
antimonysarah
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Improving rear fender coverage on a Brompton

Tired of finding sand in my hair after a wet ride on my Brompton -- anyone ever mod the fenders for improved coverage? I need to not interfere with the fold at all. I'm not sure if the water is going around the sides of the fender or up past the back of it, since I can't actually see it, but I get grit and water all over my back.
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Old 06-27-13, 10:33 AM   #2
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Hi,



If its going round the side of the rear fender I guess you could
mod it with strip of inner tube or similar. Disassemble the rear
fender and fit between the stays and the fender. Back half
should be easy, you may need to be creative with the front
half to prevent any tyre rub, dots of superglue ?

rgds, sreten.
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Old 06-27-13, 10:40 AM   #3
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Originally Posted by sreten View Post
Back half
should be easy, you may need to be creative with the front
half to prevent any tyre rub, dots of superglue ?

rgds, sreten.
Huh, it was the back half that was really puzzling me -- how to do something compatible with flipping the wheel under to fold. Old tube is a good idea for materials -- everything I was thinking of was too brittle, but old tires/tubes are flexible (and effectively free for anyone who bikes ).
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Old 06-27-13, 02:00 PM   #4
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Replace the rear mud flap with one like the front. The heavy-duty rubber sold at hardware stores for lining tool box drawers is perfect for this. Curve it like the front and it'll pop back into place when you unfold.
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Old 06-27-13, 03:04 PM   #5
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Replace the rear mud flap with one like the front. The heavy-duty rubber sold at hardware stores for lining tool box drawers is perfect for this. Curve it like the front and it'll pop back into place when you unfold.
Thanks!
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Old 06-27-13, 04:14 PM   #6
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Just bear in mind the wear and tear of the rear folding motion.. on that Mudguard addition..

maybe cut an old waterbottle in half, and use it .. its curved..
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Old 06-28-13, 03:00 AM   #7
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This the modification I did to the Mezzo to prevent spay coming up the end of the rear mud guard. I a cut a piece out of plastic fruit juice bottle attached to the end of the mud guard with a good quality water resistant double sided sticky tape. Here is a photo of the mod, not very pretty but very effective, cheap and easy to replace if damaged.

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Old 06-28-13, 08:48 AM   #8
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Quote:
Originally Posted by antimonysarah View Post
I'm not sure if the water is going around the sides of the fender or up past the back of it, since I can't actually see it, but I get grit and water all over my back.
This calls for a scientific experiment. Tape a wide cardboard above the fender, ride in water/mud and see where it gets dirty.
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Old 06-28-13, 12:32 PM   #9
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Interesting... I've ridden my Brompton in the rain, and can't say I've had any significant problems.
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Old 06-28-13, 05:08 PM   #10
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Originally Posted by fietsbob View Post
Just bear in mind the wear and tear of the rear folding motion.. on that Mudguard addition..

maybe cut an old waterbottle in half, and use it .. its curved..
Waterbottle plastic is pretty stiff. Rubber matting is totally flexible. Plus,if it gets torn up in a year,you just make another. I've gotten a good dozen flaps out of the roll I have,and I still have enough left for a couple more.
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Old 06-28-13, 06:30 PM   #11
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The problem is the rear guard doesn't extend far enough round the circumference of the wheel - for crud be kept at bay and not go airborne over your back or head, it should really extend to about 9 o'clock on the wheel.

I've been thinking a lot about this lately as I'm actually fabricating a skinny set of mudguards for my Brompton which is running 22mm Primo Champ tyres. The OEM Brompton mudguards are waaay too wide for these tyres so I've been experimenting with heat-forming lengths of PVC drainage pipe to some success.

The technique is basically - heat a strip (half a pipe of 2" pipe in profile) it till pliable in the oven at a heat that isn't so hot as to cause bubbling/burning, then pulling it out and stretching it directly (using gloves) over the wheel and inflated tyre. Once cooled Voila - you have a nice tight fitting plastic arc for your wheel. Some time spent on a wheel truing machine with a pen and masking tape means I can then draw nice neat arcs to the width I need and use a dremel with cutting disk and then polisher to trim it to size. Am adapting existing some Brompton hardware to fit, though it's getting pretty custom now.

Anyway - doing this I plan to make the rear guard as long at the back as is humanly possible so the upward flinging of water you get will be minimised.

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Old 06-29-13, 08:58 AM   #12
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Quote:
Originally Posted by dynaryder View Post
Replace the rear mud flap with one like the front. The heavy-duty rubber sold at hardware stores for lining tool box drawers is perfect for this. Curve it like the front and it'll pop back into place when you unfold.
+1. I would try this first. If rubber is heavy or too sloppy try leather.
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Old 01-08-15, 01:46 AM   #13
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Hello, does anyone know if this would fit a Brompton (rear mudflap);

SKS P35 spoiler for mudguards offers at the cycling shop Rose Bikes UK

Thanks in advance!
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Old 01-08-15, 10:26 AM   #14
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Know, like put out the 3 quid for it and done it first?, no. I'll say should, after measuring the mudguard width,

+ they, in all likely hood, get the SKS company to make the Mudguards they install in the factory..


Nut and bolt fitting fell out and I lost the stock flap, A Poprivet was what I used to keep that from happening (replacement of same) again.
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