Top Fuel (Gen 4) 2025

Source: https://trekbikes.com/us/en_US/.../top-fuel-9-9-xtr-di2-gen-4

MTB Trail

Geometry by size

Swipe sideways for more sizes

Measurement	1 High	1 Low	2 High	2 Low	3 High	3 Low	4 High	4 Low	5 High	5 Low
Frame geometry
Stack	566 mm	570 mm	599 mm	603 mm	604 mm	607 mm	608 mm	612 mm	626 mm	630 mm
Reach	422 mm	417 mm	452 mm	447 mm	467 mm	462 mm	482 mm	477 mm	512 mm	507 mm
Stack / Reach	1.34	1.37	1.32	1.35	1.29	1.31	1.26	1.28	1.22	1.24
Head tube angle	65.9°	65.5°	65.9°	65.5°	65.9°	65.5°	65.9°	65.5°	65.9°	65.5°
Seat tube angle (effective)	76.5°	76°	77.3°	76.9°	76.6°	76.2°	76.3°	75.9°	75.6°	75.2°
Seat tube angle (actual)	—	—	—	—	—	—	—	—	—	—
Top tube (effective)	558 mm	559 mm	587 mm	588 mm	611 mm	612 mm	630 mm	631 mm	672 mm	673 mm
Head tube length	105 mm	105 mm	105 mm	105 mm	110 mm	110 mm	115 mm	115 mm	135 mm	135 mm
Seat tube length	360 mm	360 mm	410 mm	410 mm	420 mm	420 mm	435 mm	435 mm	470 mm	470 mm
Bottom bracket drop	10 mm	16 mm	26 mm	32 mm	26 mm	32 mm	26 mm	32 mm	26 mm	32 mm
Bottom bracket height	351 mm	345 mm	354 mm	348 mm	354 mm	348 mm	354 mm	348 mm	354 mm	348 mm
Chainstay	434 mm	435 mm	434 mm	435 mm	439 mm	440 mm	439 mm	440 mm	444 mm	445 mm
Front center	717 mm	717 mm	755 mm	755 mm	772 mm	772 mm	789 mm	789 mm	827 mm	827 mm
Wheelbase	1150 mm	1151 mm	1188 mm	1188 mm	1210 mm	1210 mm	1227 mm	1227 mm	1270 mm	1271 mm
Fork rake (offset)	43 mm	43 mm	43 mm	43 mm	43 mm	43 mm	43 mm	43 mm	43 mm	43 mm
Fork axle to crown	—	—	—	—	—	—	—	—	—	—
Trail	111 mm	115 mm	121 mm	125 mm	121 mm	125 mm	121 mm	125 mm	121 mm	125 mm
Standover	705 mm	700 mm	755 mm	750 mm	757 mm	752 mm	758 mm	753 mm	763 mm	758 mm
Pad / effective stack	—	—	—	—	—	—	—	—	—	—
Pad / effective reach	—	—	—	—	—	—	—	—	—	—
Cockpit
Grip reach	—	—	—	—	—	—	—	—	—	—
Grip stack	—	—	—	—	—	—	—	—	—	—
Stem length	—	—	—	—	—	—	—	—	—	—
Spacer height	—	—	—	—	—	—	—	—	—	—
Bar reach	—	—	—	—	—	—	—	—	—	—
Bar drop	—	—	—	—	—	—	—	—	—	—
Bar flare	—	—	—	—	—	—	—	—	—	—
Handlebar width	—	—	—	—	—	—	—	—	—	—
Components (informational)
Crank length	—	—	—	—	—	—	—	—	—	—
Saddle width	—	—	—	—	—	—	—	—	—	—
Seatpost length	—	—	—	—	—	—	—	—	—	—
Tire clearance	—	—	—	—	—	—	—	—	—	—
Front travel	—	—	—	—	—	—	—	—	—	—
Rear travel	—	—	—	—	—	—	—	—	—	—

Loading geometry…

Measurement	1 High	1 Low	2 High	2 Low	3 High	3 Low	4 High	4 Low	5 High	5 Low
Frame geometry
Stack	566 mm	570 mm	599 mm	603 mm	604 mm	607 mm	608 mm	612 mm	626 mm	630 mm
Reach	422 mm	417 mm	452 mm	447 mm	467 mm	462 mm	482 mm	477 mm	512 mm	507 mm
Stack / Reach	1.34	1.37	1.32	1.35	1.29	1.31	1.26	1.28	1.22	1.24
Head tube angle	65.9°	65.5°	65.9°	65.5°	65.9°	65.5°	65.9°	65.5°	65.9°	65.5°
Seat tube angle (effective)	76.5°	76°	77.3°	76.9°	76.6°	76.2°	76.3°	75.9°	75.6°	75.2°
Seat tube angle (actual)	—	—	—	—	—	—	—	—	—	—
Top tube (effective)	558 mm	559 mm	587 mm	588 mm	611 mm	612 mm	630 mm	631 mm	672 mm	673 mm
Head tube length	105 mm	105 mm	105 mm	105 mm	110 mm	110 mm	115 mm	115 mm	135 mm	135 mm
Seat tube length	360 mm	360 mm	410 mm	410 mm	420 mm	420 mm	435 mm	435 mm	470 mm	470 mm
Bottom bracket drop	10 mm	16 mm	26 mm	32 mm	26 mm	32 mm	26 mm	32 mm	26 mm	32 mm
Bottom bracket height	351 mm	345 mm	354 mm	348 mm	354 mm	348 mm	354 mm	348 mm	354 mm	348 mm
Chainstay	434 mm	435 mm	434 mm	435 mm	439 mm	440 mm	439 mm	440 mm	444 mm	445 mm
Front center	717 mm	717 mm	755 mm	755 mm	772 mm	772 mm	789 mm	789 mm	827 mm	827 mm
Wheelbase	1150 mm	1151 mm	1188 mm	1188 mm	1210 mm	1210 mm	1227 mm	1227 mm	1270 mm	1271 mm
Fork rake (offset)	43 mm	43 mm	43 mm	43 mm	43 mm	43 mm	43 mm	43 mm	43 mm	43 mm
Fork axle to crown	—	—	—	—	—	—	—	—	—	—
Trail	111 mm	115 mm	121 mm	125 mm	121 mm	125 mm	121 mm	125 mm	121 mm	125 mm
Standover	705 mm	700 mm	755 mm	750 mm	757 mm	752 mm	758 mm	753 mm	763 mm	758 mm
Pad / effective stack	—	—	—	—	—	—	—	—	—	—
Pad / effective reach	—	—	—	—	—	—	—	—	—	—
Cockpit
Grip reach	—	—	—	—	—	—	—	—	—	—
Grip stack	—	—	—	—	—	—	—	—	—	—
Stem length	—	—	—	—	—	—	—	—	—	—
Spacer height	—	—	—	—	—	—	—	—	—	—
Bar reach	—	—	—	—	—	—	—	—	—	—
Bar drop	—	—	—	—	—	—	—	—	—	—
Bar flare	—	—	—	—	—	—	—	—	—	—
Handlebar width	—	—	—	—	—	—	—	—	—	—
Components (informational)
Crank length	—	—	—	—	—	—	—	—	—	—
Saddle width	—	—	—	—	—	—	—	—	—	—
Seatpost length	—	—	—	—	—	—	—	—	—	—
Tire clearance	—	—	—	—	—	—	—	—	—	—
Front travel	—	—	—	—	—	—	—	—	—	—
Rear travel	—	—	—	—	—	—	—	—	—	—

Measurement

1 High

1 Low

2 High

2 Low

3 High

3 Low

4 High

4 Low

5 High

5 Low

Frame geometry

Stack

566 mm

570 mm

599 mm

603 mm

604 mm

607 mm

608 mm

612 mm

626 mm

630 mm

Reach

422 mm

417 mm

452 mm

447 mm

467 mm

462 mm

482 mm

477 mm

512 mm

507 mm

Stack / Reach

1.34

1.37

1.32

1.35

1.29

1.31

1.26

1.28

1.22

1.24

Head tube angle

65.9°

65.5°

65.9°

65.5°

65.9°

65.5°

65.9°

65.5°

65.9°

65.5°

Seat tube angle (effective)

76.5°

76°

77.3°

76.9°

76.6°

76.2°

76.3°

75.9°

75.6°

75.2°

Seat tube angle (actual)

—

Top tube (effective)

558 mm

559 mm

587 mm

588 mm

611 mm

612 mm

630 mm

631 mm

672 mm

673 mm

Head tube length

105 mm

110 mm

115 mm

135 mm

Seat tube length

360 mm

410 mm

420 mm

435 mm

470 mm

Bottom bracket drop

10 mm

16 mm

26 mm

32 mm

26 mm

32 mm

26 mm

32 mm

26 mm

32 mm

Bottom bracket height

351 mm

345 mm

354 mm

348 mm

354 mm

348 mm

354 mm

348 mm

354 mm

348 mm

Chainstay

434 mm

435 mm

434 mm

435 mm

439 mm

440 mm

439 mm

440 mm

444 mm

445 mm

Front center

717 mm

755 mm

772 mm

789 mm

827 mm

Wheelbase

1150 mm

1151 mm

1188 mm

1210 mm

1227 mm

1270 mm

1271 mm

Fork rake (offset)

43 mm

Fork axle to crown

—

Trail

111 mm

115 mm

121 mm

125 mm

121 mm

125 mm

121 mm

125 mm

121 mm

125 mm

Standover

705 mm

700 mm

755 mm

750 mm

757 mm

752 mm

758 mm

753 mm

763 mm

758 mm

Pad / effective stack

—

Pad / effective reach

—

Cockpit

Grip reach

—

Grip stack

—

Stem length

—

Spacer height

—

Bar reach

—

Bar drop

—

Bar flare

—

Handlebar width

—

Components (informational)

Crank length

—

Saddle width

—

Seatpost length

—

Tire clearance

—

Front travel

—

Rear travel

—