Specialized 05FSR > Blackburn Dirt Merchant Rear Fender Adapter

by hewsonchen, published

Specialized 05FSR > Blackburn Dirt Merchant Rear Fender Adapter by hewsonchen Jan 29, 2013
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6593Views 575Downloads Found in Sport & Outdoors


my dirt merchant rear fender recently died and broke off... perhaps it was tired of living as it promptly scuttled under a nearby car and took me a bit of time to retrieve! anyhow i decided to disappoint it by creating this mount and dragging it, kicking and screaming, back into service. (you will have to die another day, dirt merchant!)

This is an adapter to mount a particular kind of rear fender (a blackburn dirt merchant) to the swingarm of a particular mountain bike (a specialized 05fsr xc comp). as you will notice from the pics, i have some incredibly small 1.25" road tires mounted on my 21" rims, so with the mount, the fender will not clear normal knobby MTB tires.

chances are, few of you will happen to have this combination of bike / fender / tires lying around, but perhaps this part will serve as a decent basis for your own design - it probably would not take much work to adapt it to another dual suspension bike, or perhaps add parts to be able to print a full rear fender?

in the pics i left the part in orange for clarity, although i will probably spray it black.


for my bike, uniform scaling so that the y-axis is 138mm long works well. (not needing something very pretty) i just stuck with the standard medium settings on my rep 2, v7 firmware.

the part screws into the fender with two screws, snaps onto two legs of the swingarm, and then zip-ties in front with one zip-tie.

also, it would probably make mounting more pleasant to change the zip-tie opening so that it leans the opposite way, although it does work as is so i left it.

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OK after 8 months of city riding, the adapter finally broke sort of mid-leg (predictably, i guess) where it gets thinnest... both legs snapped at the same time, in the same place, after hitting a pot-hole... that was with 2 shells, 15% fill and .27 layer height on my rep2... i may try another go-round with 3 shells to see if that makes it last longer...? shrug!

Greetings fellow biker. I was thinking to make fender for rear shock for V10 frame. Tell me how strong is your fender mount and can it take some rocks or mud blobs, or landings without braking off

good question! i should first say that i have ridden a whopping 1 city block with this thing, but i'll update as i use it more!

but to try to address your question:
the way the fender is positioned, i have it close enough to my rear tire (like maybe .5-1 cm??) that if i land hard enough the adapter doesn't see much flex -- the fender just skips off the rear tire. probably not acceptable if you are going to be doing enough rough riding that the thing will be regularly skipping off the tire (and robbing you of precious speed!)

so for my mostly city commuting purposes (i know, i know, silly to have dual suspension for something like that, but i only have this one bike!) i think it will hold up ok... (mostly i wonder how long it will last before someone snips the zip tie and decides to run off with the fender, hah! sigh...)

for more heavy duty use, the weak point is where the arms get skinny - in fact, when i did a low quality, 1 walled, 5% fill print, the skinny part of one of the legs snapped just from me jockeying the thing around. also the arms connect to the "main body" further forward than they need to (further increasing strain on the connection of the arms to the body, i suppose) but i figured i should leave them that far forward in case i wanted to angle things to accommodate a full-sized mountain bike tire? (the thing is currently sized to fit a small 1.25" on a 21" rim, so that is the first thing to merit/require adjustment for proper off road work ...)

finally i would say that the zip-tie up front sort of lends a little bit of flexibility to the whole system (it is not cranked super tight)... allowing the adapter to pivot a bit as needed, which may help things...?

the v10 2005-2007 issiue was that the little carbon fender that was sticking up was breaking off perhaps due to bottom out and hitting saddle, new v 10 got fender bended to front just to cover damper, that i want to copy for my bike, I also got unfinished bender fender for front wheel it baerly fits my 20x20 build platform but it's flat 0.9mm high print to bend it and mount under booster and to lower legs via zip ties. I need just to figure out offset between booster mount and leg mounts and it's ready to be printed.