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Topeak DeFender RX 279er Rear Fender
Topeak DeFender RX 279er Rear Fender
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Topeak DeFender RX 279er Rear Fender 2
Topeak DeFender RX 279er Rear Fender 1

Topeak DeFender RX 279er Rear Fender


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Mfg PartNum: TC9646
SALE: $18.36
MSRP: $22.95
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Keep Your Guard Up

It's time to take your bike's capabilities up a notch and hit the trails less traveled. Specifically designed for 27.5" and 29" wheeled MTB's, the Topeak DeFender™ RX 279er rear fender is the perfect choice for lightweight durable mud protection on those wet and sloppy rides.

Durability is crucial when out on the mountain, which is why this fender features an ultra-strong construction of two-tone injected plastic. This highly impact-resistant material is perfect for the pump track as well as full sends, so don't hold back. Plus, rear angle adjustment is perfect for customizing your bike to handle exactly what you need it to.

Quick-release allows DeFender™ to be installed and removed in seconds, while the ultra-secure seatpost attachment isn't easily bothered by sharp turns and unpredictable terrain. A highly polished underside helps prevent dirt buildup and aids in cleaning.


  • Fits 27.5" – 29" MTB tires up to 3" wide
  • QR seatpost attachment
  • Rear angle adjustable
  • Two tone injected high impact resistant plastic
  • Measuring in at 61cm x 18cm x 10cm / 24" x 7.1" x 3.9"
  • Weighing in at 226 g

B-Stock - This product has one or more B-Stock units available. These units can be purchased at a discount (see option select). B-Stock units were returned from other customers and may have missing or damaged packaging materials. These units are otherwise as new. The full manufacturer warranty applies. Click Here for more information.


Mfg PartNum: TC9646 

Application: MTB 

Coverage: Rear 

Mount Type: Clip-On 

Wheel Size: 700C/29 (ISO 622) 

Wheel Size: 650b/27.5 and 26 inch 


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Reviewed 12/31/2022
by TheJYD
Cycling Enthusiast
Value Rating
Overall Rating
You get what you pay for

The search for an adequate MTB rear fender continues. Do not waste your time with this one. It came out of the box crooked. I can sort of live with that but I don't love it. I suppose you could heat it up and try to reset it to straight but doesn't seem like you should have to. I could also return it but it's a hassle and I don't really want to have to try that hard for a $20 fender. Any clip on fender that requires reading the instructions to mount properly should be a miss also.

I got it installed on my 29 hard tail and proceeded to try to ride with it today. It lasted 15 minutes before I took it off and and stashed it in the woods and came back later to get it with the car. During the 15 minutes it repeatedly rubbed the rear tire, bounced around and made a terrific racket. It shouldn't have to be this hard.

I suppose if you rode only on bike paths or very smooth gravel roads then perhaps this thing would work, but as a trail fender it is absolutely god awful.

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Reviewed 4/28/2022
by lakemont biker
Cycling Enthusiast
Bellevue, WA
Value Rating
Overall Rating
1 of 1 customers found this review helpful.
not for rear suspension and a dropper post

I wanted to like this fender. I had an earleir version for years that had a shorter strut between the clamp and the fender.

The long strut makes it impossible to accomodate even moderate rear shock travel. The weel rubs against the inside of the fender even when riding a gently undulating trail. Hopefully BTD will take it back.

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Reviewed 1/31/2022
by Kirk005
San Jose, CA
Overall Rating
Easy peasy

Super easy mounting, good quality, works great! BTD has always worked for me!

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