Trek Top Fuel AL Gen 4 Frameset

Frame

Top Fuel AL Gen 4 Frameset

Specifications

Manufacturer
Trek
Name
Top Fuel AL Gen 4 Frameset
Discipline
Mountain
Material
Carbon
Head Tube
Tapered
Upper S.H.I.S
IS42/28.6
Lower S.H.I.S
IS52/40
Seatpost Diameter (mm)
34.9[1]
Wheel Sizes
700c / 29", 650b / 27.5"
Frame Size
S, M, M/L, L, XL
Rear Axle Standard
12 × 148 mm (Boost)
Rear Derailleur Mount
UDH[2]
Disc Brake Mount
Post Mount[3]
Cable Routing
Internal
Max Chainring Size (T)
34[4]
Sources
  1. [1] trekbikes.com, checked 23 Aug 2026: Seatpost Diameter (mm)
  2. [2] vitalmtb.com, checked 17 Aug 2026: Rear Derailleur Mount
  3. [3] vitalmtb.com, checked 17 Aug 2026: Disc Brake Mount
  4. [4] tritoncycles.co.uk, checked 18 Aug 2026: Max Chainring Size (T)

Compatibility

Trek Top Fuel AL Gen 4 Frameset is a Trek mtb frame. Everything listed below was matched on a specification we hold for both parts: the interface each pairing actually depends on, such as freehub body, speed count, actuation or mounting standard. Where we could not verify that interface, the part is left out rather than assumed to fit.

Brake calipers this frame mounts20

2-PISTON BRAKE CALIPER (BR-MT200)Mechanically compatible

Shimano

2-PISTON BRAKE CALIPER (BR-MT200)

  • Both use a post mount disc brake
2-PISTON BRAKE CALIPER (BR-MT500)Mechanically compatible

Shimano

2-PISTON BRAKE CALIPER (BR-MT500)

  • Both use a post mount disc brake
4-PISTON BRAKE CALIPERMechanically compatible

Shimano

4-PISTON BRAKE CALIPER

  • Both use a post mount disc brake
4-PISTON BRAKE CALIPER (BR-MT420)Mechanically compatible

Shimano

4-PISTON BRAKE CALIPER (BR-MT420)

  • Both use a post mount disc brake
4-PISTON BRAKE CALIPER (BR-MT520)Mechanically compatible

Shimano

4-PISTON BRAKE CALIPER (BR-MT520)

  • Both use a post mount disc brake
AFTERBURNER MTBMechanically compatible

FSA

AFTERBURNER MTB

  • Both use a post mount disc brake
Brake Caliper (BR-M00B-160F)Mechanically compatible

LTWOO

Brake Caliper (BR-M00B-160F)

  • Both use a post mount disc brake
Brake Caliper (BR-M00B-160R)Mechanically compatible

LTWOO

Brake Caliper (BR-M00B-160R)

  • Both use a post mount disc brake
Brake Caliper (BR-M01B-160F)Mechanically compatible

LTWOO

Brake Caliper (BR-M01B-160F)

  • Both use a post mount disc brake
Brake Caliper (BR-M01B-160R)Mechanically compatible

LTWOO

Brake Caliper (BR-M01B-160R)

  • Both use a post mount disc brake
DEORE 2-PISTON BRAKE CALIPER (BR-MT410)Mechanically compatible

Shimano

DEORE 2-PISTON BRAKE CALIPER (BR-MT410)

  • Both use a post mount disc brake
EVO GR4Mechanically compatible

Hope

EVO GR4

  • Both use a post mount disc brake
EVO TR4Mechanically compatible

Hope

EVO TR4

  • Both use a post mount disc brake
Evo X2Mechanically compatible

Hope

Evo X2

  • Both use a post mount disc brake
MA3000 Hydraulic Brake Caliper Set (MTB)Mechanically compatible

WheelTop

MA3000 Hydraulic Brake Caliper Set (MTB)

  • Both use a post mount disc brake
RX4+SL PMMechanically compatible

Hope

RX4+SL PM

  • Both use a post mount disc brake
Tech 3 DuoMechanically compatible

Hope

Tech 3 Duo

  • Both use a post mount disc brake
Tech 4 V4Mechanically compatible

Hope

Tech 4 V4

  • Both use a post mount disc brake
XCR Pro E4Mechanically compatible

Hope

XCR Pro E4

  • Both use a post mount disc brake
XCR Pro X2Mechanically compatible

Hope

XCR Pro X2

  • Both use a post mount disc brake

Headsets for this head tube20

110 Ceramic IS42/28.6 / IS52/40Mechanically compatible

Cane Creek

110 Ceramic IS42/28.6 / IS52/40

  • The upper cup is a IS42 fit
  • The lower cup is a IS52 fit
110 IS42/28.6 / IS52/40Mechanically compatible

Cane Creek

110 IS42/28.6 / IS52/40

  • The upper cup is a IS42 fit
  • The lower cup is a IS52 fit
DropSet 2Mechanically compatible

Chris King

DropSet 2

  • The upper cup is a IS42 fit
  • The lower cup is a IS52 fit
DropSet 5Mechanically compatible

Chris King

DropSet 5

  • The upper cup is a IS42 fit
  • The lower cup is a IS52 fit
Fifty IS42/28.6 / IS52/40Mechanically compatible

Cane Creek

Fifty IS42/28.6 / IS52/40

  • The upper cup is a IS42 fit
  • The lower cup is a IS52 fit
Forty IS42/28.6 / IS52/40Mechanically compatible

Cane Creek

Forty IS42/28.6 / IS52/40

  • The upper cup is a IS42 fit
  • The lower cup is a IS52 fit
Hellbender 70 IS42/28.6 / IS52/40Mechanically compatible

Cane Creek

Hellbender 70 IS42/28.6 / IS52/40

  • The upper cup is a IS42 fit
  • The lower cup is a IS52 fit
Hellbender 70 Lite IS42/28.6 / IS52/40Mechanically compatible

Cane Creek

Hellbender 70 Lite IS42/28.6 / IS52/40

  • The upper cup is a IS42 fit
  • The lower cup is a IS52 fit
Hellbender 70 Slam IS42/28.6 / IS52/40Mechanically compatible

Cane Creek

Hellbender 70 Slam IS42/28.6 / IS52/40

  • The upper cup is a IS42 fit
  • The lower cup is a IS52 fit
iRiX IS42/IS52Mechanically compatible

Industry Nine

iRiX IS42/IS52

  • The upper cup is a IS42 fit
  • The lower cup is a IS52 fit
Premium IS Headset - Integrated Standard - IS42/28.6 / IS52/40Mechanically compatible

Wolf Tooth

Premium IS Headset - Integrated Standard - IS42/28.6 / IS52/40

  • The upper cup is a IS42 fit
  • The lower cup is a IS52 fit
IS42/28.6 Upper CupShares a standard

Acros

IS42/28.6 Upper Cup

  • The upper cup is a IS42 fit
IS52 Lower CupShares a standard

Acros

IS52 Lower Cup

  • The lower cup is a IS52 fit
IS52/30 Lower CupShares a standard

Acros

IS52/30 Lower Cup

  • The lower cup is a IS52 fit
IS52/40 Lower CupShares a standard

Acros

IS52/40 Lower Cup

  • The lower cup is a IS52 fit
Classic Integrated IS Upper HeadsetShares a standard

Ritchey

Classic Integrated IS Upper Headset

  • The upper cup is a IS42 fit
Comp Integrated IS Lower HeadsetShares a standard

Ritchey

Comp Integrated IS Lower Headset

  • The lower cup is a IS52 fit
MK0 IS Headset - Integrated Standard - IS42/28.6 UpperShares a standard

Wolf Tooth

MK0 IS Headset - Integrated Standard - IS42/28.6 Upper

  • The upper cup is a IS42 fit
Premium IS52 Aero Headset for Semi-Internal RoutingShares a standard

Wolf Tooth

Premium IS52 Aero Headset for Semi-Internal Routing

  • The lower cup is a IS52 fit
Premium IS52 Internal Aero Headset for ENVE IN-Route SystemShares a standard

Wolf Tooth

Premium IS52 Internal Aero Headset for ENVE IN-Route System

  • The lower cup is a IS52 fit

Seatposts for this seat tube16

Divine 2.0Mechanically compatible

BikeYoke

Divine 2.0

  • Both are 34.9mm
Highline 3 Dropper PostMechanically compatible

Crankbrothers

Highline 3 Dropper Post

  • Both are 34.9mm
LEV CircuitMechanically compatible

KS

LEV Circuit

  • Both are 34.9mm
LEV IntegraMechanically compatible

KS

LEV Integra

  • Both are 34.9mm
Loam Dropper Post Gen 2Mechanically compatible

PNW Components

Loam Dropper Post Gen 2

  • Both are 34.9mm
RAGE-i 2.0Mechanically compatible

KS

RAGE-i 2.0

  • Both are 34.9mm
Rage-iSMechanically compatible

KS

Rage-iS

  • Both are 34.9mm
Resolve Dropper Post rev2Mechanically compatible

Wolf Tooth

Resolve Dropper Post rev2

  • Both are 34.9mm
Reverb AXSMechanically compatible

RockShox

Reverb AXS

  • Both are 34.9mm
Revive 3.0Mechanically compatible

BikeYoke

Revive 3.0

  • Both are 34.9mm
TransferMechanically compatible

Fox

Transfer

  • Both are 34.9mm
Transfer NeoMechanically compatible

Fox

Transfer Neo

  • Both are 34.9mm
V3 Dropper PostMechanically compatible

OneUp Components

V3 Dropper Post

  • Both are 34.9mm
VantageMechanically compatible

KS

Vantage

  • Both are 34.9mm
Tellis V1 Dropper PostMechanically compatible

SDG

Tellis V1 Dropper Post

  • Both are 34.9mm
Tellis V2 Dropper PostMechanically compatible

SDG

Tellis V2 Dropper Post

  • Both are 34.9mm

Forks with a matching steerer and wheel size20

29er Full Carbon Rigid Mtb Plus ForkMechanically compatible

LightCarbon

29er Full Carbon Rigid Mtb Plus Fork

  • Both use a tapered 1-1/8" to 1.5" steerer
  • Both are built for 700c wheels
700C Disc Brake CX Fork Gravel Carbon ForkMechanically compatible

LightCarbon

700C Disc Brake CX Fork Gravel Carbon Fork

  • Both use a tapered 1-1/8" to 1.5" steerer
  • Both are built for 700c/650b wheels
700C Disc Brake Gravel Carbon Fork Aero Gravel Bike ForkMechanically compatible

LightCarbon

700C Disc Brake Gravel Carbon Fork Aero Gravel Bike Fork

  • Both use a tapered 1-1/8" to 1.5" steerer
  • Both are built for 700c/650b wheels
700C Disc Brake Gravel Carbon Fork Racing Gravel ForkMechanically compatible

LightCarbon

700C Disc Brake Gravel Carbon Fork Racing Gravel Fork

  • Both use a tapered 1-1/8" to 1.5" steerer
  • Both are built for 700c/650b wheels
Allroad ForkMechanically compatible

Deda Elementi

Allroad Fork

  • Both use a tapered 1-1/8" to 1.5" steerer
  • Both are built for 700c wheels
BelvaMechanically compatible

Formula

Belva

  • Both use a tapered 1-1/8" to 1.5" steerer
  • Both are built for 700c/650b wheels
Bomber ZMechanically compatible

Marzocchi

Bomber Z

  • Both use a tapered 1-1/8" to 1.5" steerer
  • Both are built for 700c wheels
Bomber Z1Mechanically compatible

Marzocchi

Bomber Z1

  • Both use a tapered 1-1/8" to 1.5" steerer
  • Both are built for 700c/650b wheels
Bomber Z1 CoilMechanically compatible

Marzocchi

Bomber Z1 Coil

  • Both use a tapered 1-1/8" to 1.5" steerer
  • Both are built for 700c wheels
Bomber Z1 E-OptimizedMechanically compatible

Marzocchi

Bomber Z1 E-Optimized

  • Both use a tapered 1-1/8" to 1.5" steerer
  • Both are built for 700c wheels
Bomber Z2Mechanically compatible

Marzocchi

Bomber Z2

  • Both use a tapered 1-1/8" to 1.5" steerer
  • Both are built for 700c/650b wheels
Bomber Z2 E-OptimizedMechanically compatible

Marzocchi

Bomber Z2 E-Optimized

  • Both use a tapered 1-1/8" to 1.5" steerer
  • Both are built for 700c wheels
Cutthroat Carbon ForkMechanically compatible

Salsa

Cutthroat Carbon Fork

  • Both use a tapered 1-1/8" to 1.5" steerer
  • Both are built for 700c wheels
Firestarter Carbon ForkMechanically compatible

Salsa

Firestarter Carbon Fork

  • Both use a tapered 1-1/8" to 1.5" steerer
  • Both are built for 700c/650b wheels
🚲Mechanically compatible

Lauf

Grit

  • Both use a tapered 1-1/8" to 1.5" steerer
  • Both are built for 700c/650b wheels
🚲Mechanically compatible

Lauf

Grit SL

  • Both use a tapered 1-1/8" to 1.5" steerer
  • Both are built for 700c/650b wheels
JOSH BRYCELAND SELVAMechanically compatible

Formula

JOSH BRYCELAND SELVA

  • Both use a tapered 1-1/8" to 1.5" steerer
  • Both are built for 700c/650b wheels
Pista LeggeraMechanically compatible

Columbus

Pista Leggera

  • Both use a tapered 1-1/8" to 1.5" steerer
  • Both are built for 700c wheels
RC32Mechanically compatible

X-Fusion

RC32

  • Both use a tapered 1-1/8" to 1.5" steerer
  • Both are built for 650b wheels
RC32 29Mechanically compatible

X-Fusion

RC32 29

  • Both use a tapered 1-1/8" to 1.5" steerer
  • Both are built for 700c wheels

Frequently Asked Questions

What fits Trek Top Fuel AL Gen 4 Frameset?

On this page we list brake calipers this frame mounts, headsets for this head tube, seatposts for this seat tube, forks with a matching steerer and wheel size. Each listing was matched on a specification we hold for both parts; anything we could not verify is omitted rather than assumed to fit.

Can I mix Trek Top Fuel AL Gen 4 Frameset with road components?

Trek Top Fuel AL Gen 4 Frameset is recorded as a mtb component. Some standards do carry across (cassette spacing at a given speed count, for instance), but cable pull ratio and chainline frequently differ between mtb and road groups, so check the specific pairing rather than assuming it carries over.