For a clamp onto the seat stays, i picked up a few 3/4" clamps with the protective vinyl covering and some stainless bolts, washers, and nuts with the nylon "locking" section. You can see the clamp in these photos. (my rear derailleur cable just clears the clamp vinyl)
Once i temporarily screwed on the "V" stainless fender support arms into the clamp, and layed the rear fender up inside the frame, i could see where i had to bend the rearward arm to pick up the back fender attachment point. I also saw that i would be cutting down the fender's overall length, as the inner bike facing side was hitting the ground.
Once my attachments points were set, and the fender cut off to ject below the bottom bracket area, i appached the fender to the support arms to get a measurement for the zip-tie frame attachment points that REALLY lock the rear fender in SOLID!
Here's the upper zip ties in place, where the tie wraps around the frame and connects through 2 elongated holes i fitted to each side of the fender. I used a white magic marker to mark the elongated hole positions, and cut them with a flex shaft machine and round ball bit worked to make a wider hole. A drill bit could be used also i suppose.....
.......ignore the road dust,.....i just got back from a short 6 mile commute to grab a bite to eat.
A similar set of elongated holes were cut into the lower bottom bracket area, as seen here:
.....and a view from inside the fender:
The overall profile:
Note: I decided to have the front fender attach to just before the fork crown, in order to make use of the taller 38x700c tire. Because this Surly LHT fork was not suspension corrected and made for 26" wheels, this tire would not allow for a fender to go under. A 28x700c tire would allow a more usual front fender setup, but i needed the extra "rise" to get my 170mm crank arms and pedals up a bit more. I do have a Surly LHT 700c frork coming later today that should "correct" for the lack of a 26" suspension fork, but that experimentation will come later.
I ended up altering the fork crown fender attachment mounting plate so as to allow the fender to rise up as high as possible,....basically flush with the fork crown. Here's the change i made to the fender mount:
Bending the metal to just clear my heaset:
From inside,...the fender now is flush with the inside of the fork crown> The "cork" was fitted to keep the road grit out!
Anyway,.....the rear fender is ROCK solid now, and in this all weather commuter setup i love the disc brakes and comfort of this setup.
Oh,....i ended up using some nice 3-M company Zip-Ties i located at a used tool store locally. (i bought several packs of 6 pieces each in 6" and 12" lengths, for $1 a pack) These are heavy duty and well made!
I've given up on the CHEAT Chinese made crap from my local automotive stores. They BREAK with such regularity i just threw out a bunch. Just seem way too brittle and not worth the aggravation.