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Knolly Endorphin (2012) Frame (discontinued)

Average User Rating: (Spectacular)
Knolly Endorphin Day Glow Yellow
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Downhillers trail bike

Rating: Featured Member Review
The Good:

incredible traction, tons of tire clearance, aggressive geometry,

The Bad:

Not cheap, 4 x 4 suspension is not for everyone

Overall Review:

Seems kind of silly these days to be writing a review for a 26" bike but if you're not in a hurry to switch over to larger wheels the Endorphin should be on your short list. I've been riding this frame for almost two years now and it is the best bike I've owned to date.

First off the geometry is dialed on this bike. Slack head angle (67*), steep effective seat angle (73.5*), low BB height (13.2-4" depending on tires), and short chainstays (16.7") working all together makes this bike a ripper. The numbers puts a rider right in the center and IN the bike for great cornering manners and aggressive handling.

The 4 x 4 suspension is not everyone, but if you favor traction over pedaling performance on flatter terrain you will love the Endorphin. Your legs will give out before the bike will when climbing. The traction is caterpillar-like over ledges and steep technical terrain. The 4 x 4 suspension also makes the bike's 140mm of travel feel like more and imo transcends the trail bike category. Point this bike downhill and you'll know what I mean.

The Endorphin has all the modern features that a good trailbike should have imo: removable ISCG-05, 12x142 rear, 44mm headtube, dropper post routing.The frame comes in at a fairly light 6.5lbs with fox ctd shock.When I purchased the bike almost two years ago, the fox ctd was the only shock offered and after I few rides I immediately replaced it with a Cane Creek Double Barrel Air. I felt that was when the bike truly hit its full potential. That was also before Avalanche offered their SSD mods for the fox ctd. I highly recommend either an Avy mod or DBair for this frame.

In almost two years of flogging I haven't had a single issue with the frame. Bearings are solid/tight and still running smooth. No creaks or structural issues. There is only one cosmetic issue of the linkage bolts getting a little rusty. I'm not bothered by it but Knolly will warranty it with ones that don't if you ask. Tire/mud clearance is amazing. Throw a 2.5 tire in there and you can still stick your finger between the tire and frame.

I really can't see improving this bike other than making it carbon. Right now you can find these for $500 or more off retail which makes it very competitive even with non-boutique frames. The suspension characteristics are not for everyone but for me it's exactly what I prefer and look for in an aggressive trail bike.

Knolly - Making Kick Ass Aluminum bikes - Endorphin 27.6 2017 Review

The Good:

for me, the debate of carbon vs aluminum seems to be outdated. The cost is not worth 1-2 lbs of savings for me these days and the Knolly Endorphin reminds of of why i started riding bikes in the first place. This is coming from someone who owns carbon and AL full suspension bikes. This bike absolutely rips. It is so nimble and playful and that is with a pike 150 up front. I am a bigger build at 5'10" 190 lbs and I ride a medium, This thing wants to pop, flick and jump off every little feature it can. the rear linkage made me a little hesitant at first, but man... traction traction traction! rather your climbing a tech section full of rocks and roots, or ripping through some groomed berms, this bike holds it down. the 130 rear really holds it own, and I have yet to feel under-gunned on any of my my rides. I was incredible impressed how stable it felt, especially on the faster stuff. This bike is just plain fun and reminds me of why i started riding in the first place.

The Bad:

I have only owned this bike for a few months now and I really don't have anything bad to say at this point. When riding some more techy terrain, keeping up with my buddy's on their 160/150 bikes was a little tough as they could blow through the gnar sections while I was a little more thoughtful of my lines. To combat that, on the flatter sections of the trails, I was able to enjoy myself a little more popping off roots and rocks... I think the rear linkage makes me questionable for the long term, and will be interested to see how long the pivots and hardware hold up.

Overall Review:

As I have read elsewhere, it is downhillers trail bike. I am no downhill rider, but spend 90% of my time on trails on the east coast.. but man is this bike fun. Going back to what I said earlier, this bike reminds me of why I started riding in the first place. Not getting caught up on components, weight, what materials my frame and wheels were made of... but simply just got me excited to go ride my bike. If you want to have fun, and you are an aggressive trail rider, don't look past the Knolly Endorphin 27.5

Incredible Endo!

The Good:

Confidence inspiring, stiff, durable, nimble.

The Bad:

Not available in carbon.

Overall Review:

I have my endo built up with a 150mm pike rct3, and a ccdb cs, ks lev, hadley/flow ex wheels. 1x10 32/11-36. The bike can handle almost anything from epics to gnarly dh runs. It's also a very capable climber in the tech, pair it with the a ccdb cs or inline and it's hard to have a better 26" frame.


Product Knolly Endorphin (2012) Frame
Riding Type Trail
Rider Unisex
Sizes and Geometry
S, M, L, XL View Geometry
Size S M L XL
Top Tube Length 22.4 23.5 24.6 25.4
Head Tube Angle 67° 67° 67° 67°
Head Tube Length 4.2 4.6 4.9 4.9
Seat Tube Angle 73.5° 73.5° 73.5° 73.5°
Seat Tube Length 15.0 16.9 19.0 20.4
Bottom Bracket Height 13.4 13.4 13.4 13.4
Chainstay Length 16.7 16.7 16.7 16.7
Wheelbase 43.8 44.9 46.0 46.7
Standover 28.3 28.7 29.2 30.0
Reach 15.6 16.5 17.6 18.2
Stack 22.5 23.0 23.0 23.2
Wheel Size 26"
Frame Material Aluminum
Frame Material Details
Rear Travel 140mm
Rear Shock
Head Tube Diameter 44mm Inner Diameter Top and Bottom
Bottom Bracket
Rear Dropout / Hub Dimensions 142mm x 12mm Thru Axle
Front Derailleur Size
Seatpost Diameter 31.6mm
Max Tire Size 26" x 2.5" Rear
ISCG Tabs ISCG05 (Replaceable)
Bottle Cage Mounts Yes
Colors Blue, Day Glow Yellow, Raw, or Black
Weight N/A
Price N/A
More Info

Knolly website

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