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Knolly Endorphin Frame

Average User Rating: (Spectacular)
Vital MTB Retail Partners:
Chain Reaction Bicycles Jenson U.S.A. Competitive Cyclist Backcountry

Compare to other Frames

    Need more info? View our Trail Mountain Bike Frames buyer's guide.

    Featured Review

    “Downhillers trail bike”

    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.

    “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.

    Vital MTB Retail Partners:
    Chain Reaction Bicycles Jenson U.S.A. Competitive Cyclist Backcountry


    Riding Type Trail
    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
    Frame Material
    Rear Travel 140mm (5.5")
    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
    Seat Post 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


    Price N/A
    More Info Knolly website
    Vital MTB Retail Partners:
    Chain Reaction Bicycles Jenson U.S.A. Competitive Cyclist Backcountry