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Do (rear) bike fenders with mud flaps help prevent flying debris into kids trailers ?

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Do (rear) bike fenders with mud flaps help prevent flying debris into kids trailers ?

Old 05-19-18, 04:23 PM
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markm75
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Do (rear) bike fenders with mud flaps help prevent flying debris into kids trailers ?

This might be a silly question but its one I was hoping to double check on before i go making major changes to my bike + trailer setup..
I have one of those instep trailers that you pull for 2 and up.. its been a long while since i used it but i'm finding our little guy covered in rails to trails debris and such after a ride, especially one where drizzle suddenly falls..Granted it does have one of the pull down plastic shields, but on a really hot day that cant really be used.. so i thought maybe it was time to put some fenders on my mountain bikes that do the pulling..

I had found these Planet Bike Fenders with Mud flaps on amazon for around $50.. i'm guessing they will do the job but wanted to get some opinions first.

Thanks in advance
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Old 05-19-18, 04:59 PM
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Never done rear flaps. But I have used (and made) front flaps for many years. They stop about as much water as all the rest of both fenders (from the standpoint of that bike). I would expect the same with a rear flap, the difference being that the rear flap would be keeping dirty water off the trailer and occupant, unlike the front which is keeping far cleaner water off your bike.

The challenge would be that the rear flap wants to come down as far as a good front flap. (Don't look at a Planet Bike fender. Those flaps don't comedown remotely far enough. The first thing I do when I have Planet Bike fenders is drill out the rivets and screw on a real flap.)

Ben
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Old 05-19-18, 05:08 PM
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You will want something longer like a Cascadia.
http://www.amazon.com/Planet-Bike-Cascadia-bike-fenders/dp/B0041XC4WE/ref=sr_1_2?s=sporting-goods&ie=UTF8&qid=1526771174&sr=1-2&keywords=planet+bike+cascadia+26"+atb+fenders http://www.amazon.com/Planet-Bike-Cascadia-bike-fenders/dp/B0041XC4WE/ref=sr_1_2?s=sporting-goods&ie=UTF8&qid=1526771174&sr=1-2&keywords=planet+bike+cascadia+26"+atb+fenders

SKS makes some long ones as well.
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Old 05-19-18, 05:16 PM
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I don't think any of these rear fenders are going to come down low enough to protect the trailer and its occupants. They are made to keep water out of the riders' back, as well as the rider behind you on wet road. The problem is that the trailer is so low that water is going to spray on it anyway. You need some kind of flap that's almost touching the ground to be effective.

Edit: Perhaps the SKS Longboards might work:
http://www.chainreactioncycles.com/c...t/rp-prod68581
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Old 05-19-18, 07:45 PM
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Get a larger rubber piece, or cut off a piece of an old tire and screw that to the end of your fender in place of a mudflap. Cheap and effective. Tip: use stainless steel screws. I got my old tire for free at the local bike co-op - it was run down and ready for the garbage bin. I added a small metal brace on the inside to keep it open enough.
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Old 05-19-18, 10:01 PM
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Originally Posted by alias5000 View Post
Get a larger rubber piece, or cut off a piece of an old tire and screw that to the end of your fender in place of a mudflap. Cheap and effective. Tip: use stainless steel screws. I got my old tire for free at the local bike co-op - it was run down and ready for the garbage bin. I added a small metal brace on the inside to keep it open enough.
Or how about something like these mud guards (assuming indeed the original planet bike ones arent long enough.. I'd assume it should be hard to figure out how to attach with those stainless steel screws.. just screw into the plastic on the fender after taking off the prefab ones.
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Old 05-19-18, 10:03 PM
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Thanks all for the suggestions..

I wonder how these differ from the ones i already ordered (these again).. i guess its the flaps.. 40mm vs 130mm, quite a difference.. so maybe i should cancel/return the other planet ones and go with these and be done.. or do the mod i just posted using something like those addon flaps. I might be better off just adding on the $8 mud flaps assuming they are longer, as if i have to pay return shipping (since not prime) it is a wash.

EDIT: the sks longboards seem to have a 45mm flap from what i can see unless i'm wrong, so not much bigger than what i already had ordred.. so its either the cascadia or addon flaps i guess

Hoping too my tires are ok, i forget what width i have, maybe 1.95 in one case (two bikes eventually to get fit with these).. maybe its only 1.75.. these are listed at 60mm with 1.9 max width.

Last edited by markm75; 05-19-18 at 10:13 PM.
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Old 05-19-18, 10:09 PM
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Originally Posted by markm75 View Post
Or how about something like these mud guards (assuming indeed the original planet bike ones arent long enough.. I'd assume it should be hard to figure out how to attach with those stainless steel screws.. just screw into the plastic on the fender after taking off the prefab ones.
Have you tried screwing into the plastic? Doe it work over the long term? That never crossed my mind. I find that vibration is a real issue with fender hardware and like to use nuts and lockwashers.

Ben
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Old 05-19-18, 10:14 PM
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Originally Posted by 79pmooney View Post
Have you tried screwing into the plastic? Doe it work over the long term? That never crossed my mind. I find that vibration is a real issue with fender hardware and like to use nuts and lockwashers.

Ben
Ah thats a good point.. not sure yet, they are in route not here yet, so maybe i can get lucky and just refuse to the vendor and go for the cascadia instead, but if adding them sounds like washers and nuts is more secure, less chance of pulling through over time.. hadnt thought about that yet.
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Old 05-19-18, 10:40 PM
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Originally Posted by 79pmooney View Post
Have you tried screwing into the plastic? Doe it work over the long term? That never crossed my mind. I find that vibration is a real issue with fender hardware and like to use nuts and lockwashers.

Ben
Drill through and use nuts with nyloc nuts, works flawlessly provided you have the spacing. But even normal nuts should work well, since rubber is squishy and will help keep things in place. Use nyloc nuts on my commuter (see here, look at front fender) and never had any issues. The tire solution is not as stable side-to-side as a mudflap like these, I believe.

The planet bike mudflaps are more pointing backwards, less of an ideal solution for the intended application. If it was a good deal, you could start with them and add your own solution as you try them out.

Don't worry too much on 1.9 vs. 1.95, that should be fine. I run 60mm and used 1.95 in tires all winter.
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Old 05-20-18, 08:25 AM
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Pop rivet a piece of rubber roofing to the bottom of whatever flap you go with. Phone your local roofer, and ask for a scrap. Works wonderfully, because you can make it as long and wide as you like. Put one on the front to make it even better.
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Old 05-20-18, 07:58 PM
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Originally Posted by alias5000 View Post
Drill through and use nuts with nyloc nuts, works flawlessly provided you have the spacing. But even normal nuts should work well, since rubber is squishy and will help keep things in place. Use nyloc nuts on my commuter (see here, look at front fender) and never had any issues. The tire solution is not as stable side-to-side as a mudflap like these, I believe.

The planet bike mudflaps are more pointing backwards, less of an ideal solution for the intended application. If it was a good deal, you could start with them and add your own solution as you try them out.

Don't worry too much on 1.9 vs. 1.95, that should be fine. I run 60mm and used 1.95 in tires all winter.
When you say the planet bike ones are less ideal do you mean both the one I ordered and the Cascadia or which Curious
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Old 05-21-18, 08:17 AM
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Originally Posted by markm75 View Post
When you say the planet bike ones are less ideal do you mean both the one I ordered and the Cascadia or which Curious
Sorry, I meant the ones you ordered. I recently ordered a 20'' in fender with a similar (same?) mudflap (https://www.mec.ca/en/product/5038-0...20%22-Front%29). It's a very small one pointing about 45 degrees backwards. It'll keep the water away from your legs, but has little coverage towards the back.
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Old 05-21-18, 10:33 AM
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Originally Posted by markm75 View Post
Thanks all for the suggestions..

I wonder how these differ from the ones i already ordered (these again).. i guess its the flaps.. 40mm vs 130mm, quite a difference.. so maybe i should cancel/return the other planet ones and go with these and be done.. or do the mod i just posted using something like those addon flaps. I might be better off just adding on the $8 mud flaps assuming they are longer, as if i have to pay return shipping (since not prime) it is a wash.

EDIT: the sks longboards seem to have a 45mm flap from what i can see unless i'm wrong, so not much bigger than what i already had ordred.. so its either the cascadia or addon flaps i guess

Hoping too my tires are ok, i forget what width i have, maybe 1.95 in one case (two bikes eventually to get fit with these).. maybe its only 1.75.. these are listed at 60mm with 1.9 max width.
The 26x60 Cascadias will work with your tires. They do well as they are, but would be ideal for your purposes with a longer mudflap.

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Old 05-21-18, 04:26 PM
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On my MTB-based commuter I extended the front fender first with a portion of yoga mat material, later with a black "rubber" automotive floor mat from the dollar store. I drilled holes in the fender and used nylon nuts and bolts. I donyt see why this couldn't be done in the rear.
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Old 05-21-18, 04:28 PM
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Thee nice thing about using rubber roofing as a fender extender, is that is relatively light and flexible. You can cut it to any size and configuration you like, Use reinforcing washers on the back side of the pop rivet, and you get a really nice extension, that works very well at slower speeds, and is flexible enough to not be an encumberance when you are pushing the wind!
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