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Chainstay fender ideas

astrizzle

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Moscow, ID US

astrizzle 4/21/2020 - 4:10pm

4/21/2020 - 4:10pm Edited Date/Time 12/5/2021 2:10pm

Hey there everyone, I recently purchased a Transition Sentinel frame and noticed that there is a descent gap in the pivot point where the chainstay meets the seat tube area there.

I have seen recently that some people cover that area up with a sort of "fender" so that rocks and debris don't fall in there and get things jammed up. I was wondering if anyone had any ideas on the best material to use for a long-term solution for this and how to attach it to the frame without damaging the paint at all. Any tips would be much appreciated thanks!

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erik saunders

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Santa Barbara, CA US

erik saunders 4/21/2020 5:51pm

4/21/2020 5:51pm

oooh... this is my jam...

Check out this blog post i wrote a while back... you can use this same process to make the fender you are talking about...

https://memorypilot.com/blogs/training/diy-recycled-mountain-bike-mudguards-that-will-make-you-feel-good

the ideal material is Polyethylene... it is super tough yet bends easily, it is easy to cut to shape, it is UV resistant, and it resists cracking in the cold. Luckily, thin plastic grocery bags are normally made of Polyethylene film... if you can find a bag made from LDPE #4 (Low Density Polyethylene) you are good to go... You can also use any #2 HDPE (High Density Polyethylene) film or sheet that you can find.

Depending on the size, i probably have a scrap of .035" HDPE i can send you... itll prolly cost me a stamp... so no worries... email me on the site...

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astrizzle

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astrizzle 4/21/2020 6:34pm

4/21/2020 6:34pm

Thanks man!!!

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Falcon

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Menifee, CA US

Falcon 4/22/2020 8:26am

4/22/2020 8:26am

Dude with the chainstay fender as his avatar to the rescue! Hahahahaha.

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erik saunders

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Santa Barbara, CA US

erik saunders 4/22/2020 8:39am

4/22/2020 8:39am

Falcon wrote:

Dude with the chainstay fender as his avatar to the rescue! Hahahahaha.

ive waited my whole life for this moment...

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Big Bird

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Oceano, CA US

Big Bird 4/22/2020 8:56am

4/22/2020 8:56am

erik saunders wrote:

ive waited my whole life for this moment...

The Vital community thanks you for your patience, preparation and perseverance.

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astrizzle

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Moscow, ID US

astrizzle 4/22/2020 1:24pm

4/22/2020 1:24pm

I have some black plastic bags and an iron, just gotta get the parchment paper and I'll be good to go. Any suggestions on how to attach it to the frame? I'm hesitant to do zip ties but if I must I must.

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nathan999x

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CA

nathan999x 4/22/2020 1:41pm

4/22/2020 1:41pm

Thanks for this. I just made a Presidents Choice mudguard now. The best part is that if you mess up you can just remelt it to modify the fender.

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erik saunders

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Santa Barbara, CA US

erik saunders 4/22/2020 3:06pm

4/22/2020 3:06pm

astrizzle wrote:

I have some black plastic bags and an iron, just gotta get the parchment paper and I'll be good to go. Any suggestions on how to...

I have some black plastic bags and an iron, just gotta get the parchment paper and I'll be good to go. Any suggestions on how to attach it to the frame? I'm hesitant to do zip ties but if I must I must.

I Dm'ed you but, for the lurkers, i think you can probably rig up a strip that attached to the rear of the seat tube with 3m command strips or some other high strength, yet removable adhesive solution... its just needs to create a lap over that gap to block it and shed water... just make sure it doesnt get in the way of travel, or buzz the tire at bottom-out... i think the standard "jam a front mudguard in the back" could work too.. but it would be maybe not as good a solution as a lapped piece of plastic...

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Fox

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Durango, CO US

Fox 4/25/2020 2:47pm

4/25/2020 2:47pm

On a Yeti SB150. Keeps the spray off the SI and its parts. Made from the top of a rubbermade roughneck storage bin.

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dolface

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dolface 7/7/2021 7:37am

7/7/2021 7:37am

Not sure if this does what you need but RRP make a rear fender that's pretty slick (I have one on my 5010). https://www.rapidracerproducts.com/products/mudguards/proguard-rear.html, they can be a bit hard to source in the US, lmk if you're interested and I'll try to dig up where I got mine.

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BoogieC

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Albany, CA US

BoogieC 12/1/2021 8:18am

12/1/2021 8:18am

astrizzle wrote:

I have some black plastic bags and an iron, just gotta get the parchment paper and I'll be good to go. Any suggestions on how to...

I have some black plastic bags and an iron, just gotta get the parchment paper and I'll be good to go. Any suggestions on how to attach it to the frame? I'm hesitant to do zip ties but if I must I must.

erik saunders wrote:

I Dm'ed you but, for the lurkers, i think you can probably rig up a strip that attached to the rear of the seat tube with...

I Dm'ed you but, for the lurkers, i think you can probably rig up a strip that attached to the rear of the seat tube with 3m command strips or some other high strength, yet removable adhesive solution... its just needs to create a lap over that gap to block it and shed water... just make sure it doesnt get in the way of travel, or buzz the tire at bottom-out... i think the standard "jam a front mudguard in the back" could work too.. but it would be maybe not as good a solution as a lapped piece of plastic...

after reading this thread, i found some plastic sheets at the bottom of some old reusable plastic bags / wine carriers.

Cut to shape, used double-sided outdoor gorilla tape, and am pretty please with the result. Photos are attached, I hope (first post).

I was concerned about the bearings, so the flap is a wider then the loam shelf, but only as wide as the chainstay bearing area.

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Edthorne

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CA

Edthorne 12/1/2021 9:32am

12/1/2021 9:32am

astrizzle wrote:

I have some black plastic bags and an iron, just gotta get the parchment paper and I'll be good to go. Any suggestions on how to...

I have some black plastic bags and an iron, just gotta get the parchment paper and I'll be good to go. Any suggestions on how to attach it to the frame? I'm hesitant to do zip ties but if I must I must.

erik saunders wrote:

I Dm'ed you but, for the lurkers, i think you can probably rig up a strip that attached to the rear of the seat tube with...

I Dm'ed you but, for the lurkers, i think you can probably rig up a strip that attached to the rear of the seat tube with 3m command strips or some other high strength, yet removable adhesive solution... its just needs to create a lap over that gap to block it and shed water... just make sure it doesnt get in the way of travel, or buzz the tire at bottom-out... i think the standard "jam a front mudguard in the back" could work too.. but it would be maybe not as good a solution as a lapped piece of plastic...

BoogieC wrote:

after reading this thread, i found some plastic sheets at the bottom of some old reusable plastic bags / wine carriers. Cut to shape, used double-sided...

after reading this thread, i found some plastic sheets at the bottom of some old reusable plastic bags / wine carriers.

Cut to shape, used double-sided outdoor gorilla tape, and am pretty please with the result. Photos are attached, I hope (first post).

I was concerned about the bearings, so the flap is a wider then the loam shelf, but only as wide as the chainstay bearing area.

That looks pretty slick. How did you attach it to the chainstay?

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BoogieC

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Albany, CA US

BoogieC 12/1/2021 11:31am

12/1/2021 11:31am

erik saunders wrote:

I Dm'ed you but, for the lurkers, i think you can probably rig up a strip that attached to the rear of the seat tube with...

I Dm'ed you but, for the lurkers, i think you can probably rig up a strip that attached to the rear of the seat tube with 3m command strips or some other high strength, yet removable adhesive solution... its just needs to create a lap over that gap to block it and shed water... just make sure it doesnt get in the way of travel, or buzz the tire at bottom-out... i think the standard "jam a front mudguard in the back" could work too.. but it would be maybe not as good a solution as a lapped piece of plastic...

BoogieC wrote:

after reading this thread, i found some plastic sheets at the bottom of some old reusable plastic bags / wine carriers. Cut to shape, used double-sided...

after reading this thread, i found some plastic sheets at the bottom of some old reusable plastic bags / wine carriers.

Cut to shape, used double-sided outdoor gorilla tape, and am pretty please with the result. Photos are attached, I hope (first post).

I was concerned about the bearings, so the flap is a wider then the loam shelf, but only as wide as the chainstay bearing area.

Edthorne wrote:

That looks pretty slick. How did you attach it to the chainstay?

It's actually floating above the chainstays, and is attached to the 'loam shelf' of the main triangle by a one inch strip of really strong weather resistant double sided tape. The plastic does not slap the chainstays or make any noise. If it fails, it's easy and nearly free to replace.