Bronson 27.5" - AM - 150mm VPP Travel

The Bronson is the reference for all-mountain riding and racing, and one of our most versatile and popular models ever.

With a 67° head angle, 150mm of VPP™ travel and 27.5" wheels, the Bronson screamed onto the Enduro World Series scene like a Group B rally car.

The winning formula is Bronson's ability to deliver massive uphill capability too, thanks to a balanced geometry and efficient pedaling platform that speeds you between liason stages.

Now availble at an unprecendented carbon entry price point for R and S builds, the Bronson sets the all-mountain standard once again.

Frame Features

  • 150mm (6") VPP™ suspension
  • 27.5" wheels
  • Forged upper and lower links
  • Double sealed pivots for long bearing life
  • Dual grease ports on lower link for easy maintenance
  • Full carbon dropouts and disk mounts
  • Angular contact bearings maximize stiffness
  • Collet axle pivots lock in place without pinch bolts
  • Bottle cage mount within front triangle fits piggyback shocks
  • Molded rubber swingarm and downtube protection
  • Stealth and external seatpost cable routing
  • 142mm rear axle spacing
  • Threaded BB for creak-free riding and easy installation
  • ISCG-05 tabs for chainguide compatibility
  • Direct mount rear derailleur option

Shock Setup

Shock: Fox Float CTD Evolution

Rider WeightAir PressureShock Sag
100lbs (45.5kg) 90 psi 12-15 mm
120lbs (54.4kg) 110 psi 12-15 mm
140lbs (63.5kg) 130 psi 12-15 mm
160lbs (72.6kg) 150 psi 12-15 mm
180lbs (81.8kg) 170 psi 12-15 mm
200lbs (90.7kg) 190 psi 12-15 mm
220lbs (99.8kg) 210 psi 12-15 mm
240lbs (108.8kg) 230 psi 12-15 mm
260lbs (117.9kg) 255 psi 12-15 mm
280lbs (127kg) 280 psi 12-15 mm


Bronson Geometry
544.4mm - Axle-Crown (w/13mm - stack height)
Top Tube Length 554mm - 21.81" 584mm - 22.99" 610mm - 24.02" 635mm - 25"
Seat Tube Length 407mm - 16.02" 432mm - 17.01" 470mm - 18.5" 508mm - 20"
Head Tube Angle 67° 67° 67° 67°
Seat Tube Angle 73° 73° 73° 73°
BB Height 346mm - 13.62" 346mm - 13.62" 346mm - 13.62" 346mm - 13.62"
Wheelbase 1108mm - 43.62" 1139mm - 44.84" 1165mm - 45.87" 1192mm - 46.93"
Head Tube Length 90mm - 3.54" 100mm - 3.94" 100mm - 3.94" 120mm - 4.72"
Chainstay Length 439mm - 17.28" 439mm - 17.28" 439mm - 17.28" 439mm - 17.28"
Standover Height 718mm - 28.27" 731mm - 28.78" 733mm - 28.86" 749mm - 29.49"
Reach 375mm - 14.76" 403mm - 15.87" 428mm - 16.85" 448mm - 17.64"
Stack 584mm - 22.99" 594mm - 23.39" 594mm - 23.39" 612mm - 24.09"

* Effective top tube
** Seat Tube length measured from center of BB to top of seat tube

Size Guide

5'0" — 5'5"
5'5" — 5'10"
5'10" — 6'1"
6'1" — 6'6"

Available as Complete Bike Only

Complete Build Options

Bronson | R AM - £2,649
ForkRock Shox Sektor Gold RL SA 150mm
ShockRock Shox Monarch RT
Rear DerailleurShimano XT M786 GS Shadow Plus
Front DerailleurShimano M618 FD
ShiftersShimano SLX M670
BrakesShimano Deore M615
RotorsShimano RT66 180mm
CranksetShimano Deore M617 22/36 175mm w/BB
CassetteShimano SLX HG81 10sp 11-36
ChainKMC X10.93 10speed
HandlebarRaceface Ride 35x760
StemRaceface Ride
GripsSanta Cruz Palmdale lock-on
HeadsetCane Creek 10 series tapered, cartridge bearing
SeatpostRaceface Ride, 375mm
SaddleWTB Volt Race
Front WheelSRAM MTH 716 15x100 hub laced to WTB STi23 TCS rims
Rear WheelSRAM MTH 746 142x12 hub laced to WTB STi23 TCS rims
Rim Upgrade
Front TyreMaxxis Minion DHR2 TR 2.3, Tubeless Ready
Rear TyreMaxxis Minion DHR2 TR 2.3, Tubeless Ready
Tubes / SealantStans Sealant
Bronson | S AM - £3,399
ForkRock Shox Pike RCT3 SA 27.5" 150mm
ShockRock Shox Monarch RT
Rear DerailleurSRAM GX 1x11 RD
Front Derailleurn/a
ShiftersSRAM GX 11sp
BrakesShimano SLX M675
RotorsShimano RT66 180mm
CranksetRaceface Aeffect SL 32t 175mm w/BB
CassetteSRAM XG1150 CS 10-42
ChainSRAM PC1130
HandlebarRaceface Ride 35x760
StemRaceface Turbine Basic
GripsSanta Cruz Palmdale lock-on
HeadsetCane Creek 40 series tapered, cartridge bearing
SeatpostRockshox Reverb Stealth, 125mm travel
SaddleWTB Volt Race
Front WheelSRAM MTH 716 15x100 hub laced to Easton AR 24 32h rims
Rear WheelSRAM MTH 746 142x12 hub laced to Easton AR 24 32h rims
Rim Upgrade
Front TyreMaxxis Minion DHR2 TR 2.3, Tubeless Ready
Rear TyreMaxxis Minion DHR2 TR 2.3, Tubeless Ready
Tubes / SealantStans Sealant

Can I mount a chainguide to my bike?

Yes, this bike has been designed with ISCG-05 chainguide mounting tabs. We have had great luck with the E13 LG1 Tr, MRP Lopes guide or Mini G3. For dual ring guides, try the E13 TRS+Dual or MRP 2x guides. These should fit with minimal or no modification.

Can I use a dropper post on this bike?

Yes- we've provided routing for both internal (stealth) and external remote cables.

It looks like the lower link is off center in my frame- is everything ok?

Yes- this is correct. With our newer pivot system, the pivot axle draws the link over to one side in order to properly preload the bearings. This offset is accounted for in the frame design so everything ends up nice and straight in the end.

Should I grease the headset cups when I install them?

Yes, we recommend this. Do not use the Carbon Assembly Compound on the headset, as it will make it more difficult to remove from the frame.

What fork sizes are recommended?

We recommend 150-160mm travel. All of the forks we spec are 150mm, which we feel balances the bike the best.

What is the torque spec for the front derailleur?

Torque the front derailleur to 45 in/lbs.

What is the torque spec for the seat collar?

We don't provide a torque spec for the seatpost, because it really depends on what seatpost you are using. Some seatposts are slippery, and require more torque to stay put, and others are very thin- and can be crushed by overzealous tightening. Some are both slippery and thin... Make sure you use the Carbon Assembly Compound included with your frame, and use some common sense.

You will not damage your frame by overtightening the seat collar, assuming you have a 30.9mm seatpost in it.

What kind of front derailleur do I need?

This bike uses a 34.9mm Bottom Swing (high clamp), Top Pull front derailleur.

What kind of headset does this bike use?

We use a headset generally referred to as "mixed tapered". This is a 44mm internal upper cup, with an external 49mm lower cup. The SHIS name is ZS44/28.6 EC49/40.

What kind of rear brake adaptor do I need?

This frame uses a standard IS rear brake mount. Just pick your rotor size and order the correct adaptor to go from IS to post mount (all modern brakes).

What q-factor should I use for the cranks?

On any crank with optional Q-factor, choose the wider version.  166 for Sram XX, or 168 for XX1.  For Shimano doubles, we recommend the M980.  

What size bottom bracket shell does this bike use?

We use a standard 73mm threaded BB. Nearly any crank on the market (besides BB30 cranks) will fit.

What size hub do I need?

This bike uses a 142x12 through-axle rear hub, and includes a DT RWS axle.

What size seatpost do I need?

We use a 30.9mm seatpost. Always ensure it is inserted into the frame a minimum of 100mm (4").

What size shock does it use?

This bike uses a 200x57mm shock with 22x8mm eyelet hardware (21.8mm x 8mm for SRAM). Please do not use any other shock size or modify with eccentric shock bushings- this can cause damage or clearance issues with the frame.

Why does this frame use a standard thread-in bottom bracket, when many of your competitors use press-in style (BB30, Pressfit 30, BB90, BB92, BB86)

It is true that there are some slight weight savings available with the various pressfit bb designs (exact weight savings obviously vary depending on system, frame manufacturing techniques, and crank model), but we don't feel this small savings make up for the inconveniences. We are still able to make a frame that is lighter than most of our competitors, while still using a heavier bb system. There are a number of disadvantages that exist with press fit systems:

1) Special installation and removal tools are required for these parts, including a headset press. This is not convenient for most home mechanics, and they are quite expensive. Traditional external BB's can be installed or removed with a simple $10 hand tool.

2) "Permanently installed cups". Shimano doesn't recommend removing and re-installing their press in bb cups (as they may become damaged), so moving parts from bike to bike is no longer an option.

3) Creaking or shifting bb's can be common with these systems. Since the bearing is pressed into a cup, which is then pressed into the frame- it can be hard to get all of the press fits snug- without being too tight on the bearing or too loose in the frame.

4) Reasonable tube sizes. One of the most commonly claimed advantages of a larger bb shell is the larger diameter downtube that goes with it. This may be an advantage on road bikes, where tubes can be incredibly thin and large for optimal stiffness. On a mountain bike, this area of the frame sees a lot of abuse from rocks and crashing, and needs to have a certain amount of wall thickness to survive actual use. Using what we consider a "safe" wall thickness and carbon layup, and a fairly typical tube diameter, we get an exceedingly stiff, light, durable product. If we used a larger downtube, we would either have a heavier frame (same wall thickness but larger diameter), or a less durable product (thinner walls and larger diameter).

5) Chain clearance. Take a look at some of our competitors frames with press in bb shells. The down tube comes so close to the chainrings that many frames have chainsuck guards on the downtube! In our mind, the chain should be able to fall off on a mountain bike and not get jammed between your crank and thin-walled carbon downtube.

6) Backwards compatibility: Many of our customers purchase a frame and build it up with their choice of parts, or parts from an old bike. By using a standard bb, we are compatible with everything without requiring confusing adaptors.

7) Chainguide compatibility: While it may seem strange to talk about putting chainguides on a short travel bike, it is becoming more common now with 10 speed drivetrains. Thread in bb's mean the frame is compatible with bb mount chainguides. We like versatility....

Suspension SystemVPPTM
Front DerailleurClamp
Headset/Headtubemixed taper 1.5" Lower, 1'1/8" upper
Seat Post30.9mm
Fork Compatibility150-160mm
BB ShellStandard
Max Tire Size2.4"
Brake Typesdisc
Water Bottle Mounts2x bottle cage mounts