Trek Shock Guide

This is for guidance only. You are responsible for verifying clearance on your frame. Mount kit measurements should be checked (especially for older frames.)

You can find Trek bolts here.

Shock mount hardware is available here.


FUEL EX

 

HARDWARE

MY

Start

MY

End

Travel

Eye-to-eye

Stroke

Mount-kit

U/F

Mount-kit

L/R

Notes

2005

2006

100

165

38

6x40

6x21.8

 

2007

2007

100

165

38

6x40

6x22.2

Models: 5/ 6

2007

2007

120

190

50

8x40

8x22.2

Models: 7/ 8/ 9/ & Carbon

2008

2008

120

190

50

8x40

8x22.2

Models: 5.5/ 6.5

2008

2008

120

190

50

8x40

8x34

Models: 7/ 8/ 9/ & Carbon

2009

2009

120

190

50

8x40

8x22.2

Models: 5.5/ 6.5

2009

2009

120

190

50

8x40

8x40

Models: 7/ 8/ 9/ & Carbon

2010

2011

120

190

50

8x40

8x40

Models: 5/ 6/ 7

2010

2011

120

184

50

10x40

8x40

Models: 8/ 9/ & Carbon

2012

2012

120

190

50

8x40

8x40

Models: 5/ 6

2012

2012

120

184

50

10x40

8x40

Models: 7/ 8/ 9/ & Carbon

2013

2013

130

190

50

8x22.2

8x40

Models: 4

2013

2014

130

184

50

10x40

8x40

Models: 5 & higher

2014

2015

120

184

48

10x40

8x40

 

2015

2016

120

184

48

10x40

8x40

 

2016

2016

120

184

48

10x40

8x40

Models: 5/ 7

2016

2016

120

184

48

10x40

8x50 Offset

Models: 8/ 9/ 9.8/ 9.9

2017

2019

130

210

52.5

10x54/60

8/10x50 Offset

 

2020

2022

130

210

52.5

10x54

10x50 Offset

 27.5 Wheel

2020

2022

130

210

55

10x54

10x50 Offset

 29 Wheel

 

BOLTS

Lower Shock Axle – 599899           Upper Shock Axle – 599898

Additional bolts are only required for Thru-Shaft to standard shock conversion.  For DRCV conversion you will need a “DRCV retrofit kit”

 

SHOCK COMPATIBILITY (GEN 6)

Brand

Coil

Air

Fox

DHX

Float X

RockShox

Yes, all Shocks

Yes, all Shocks

DVO

Yes

Yes

Push

*

N/A

Ohlins

Yes

Yes

Intend

N/A

Yes

CaneCreek

Yes

Yes

Marzocchi

Yes

Yes

Fast

Yes*

N/A

 

Push* -  Push do not offer ElevenSix for this frame 

Fast* - We are yet to confirm clearance of the Evo variant 


FUEL EX E

 

HARDWARE

MY

Start

MY

End

Travel

Eye-to-eye

Stroke

Mount-kit U/F

Mount-kit

L/R

Notes

2023

-

140

205

60

Trunnion

M8x40

 

 

SHOCK COMPATIBILITY

Brand

Coil

Air

Fox

DHX

Float X

RockShox

Yes, all Shocks

Yes, all Shocks

DVO

Yes

Yes

Push

Not offered

N/A

Ohlins

Yes

Yes

Intend

N/A

Yes

CaneCreek

Yes

Yes

Marzocchi

Yes

Yes

Fast

Yes*

N/A

 

Fast* - We are yet to confirm clearance of the Evo variant 


RAIL

 

HARDWARE

MY

Start

MY

End

Travel

Eye-to-eye

Stroke

Mount-kit U/F

Mount-kit

L/R

Notes

2020

-

150

230

57.5

M10x54

M10x40

 

 

BOLTS

Trek Rail - Gen 3:

Lower Shock Axle – 5258210        Upper Shock Axle – 5258209       

Trek Rail - Gen 2:

Lower Shock Axle – 599900           Upper Shock Axle – 599898

Trek Rail - Gen 1:

Lower Shock Axle – 599900           Upper Shock Axle – 599898

 

Additional bolts are only required for Thru-Shaft to standard shock conversion.  

 

SHOCK COMPATIBILITY

Brand

Coil

Air

Fox

DHX2

DPX2, X2*

RockShox

No

Deluxe (in-line shock)

RockShox Flight Attendant

No

No

DVO

 

No

Push

No* (SS Casting)

N/A

Ohlins

Yes

Yes

Intend

N/A

Yes

CaneCreek

No

No

Marzocchi

No

No*

Fast

Fenix Enduro*

N/A

 

Fox X2* - In theory this shock fits, however, it is “too close for comfort” and any flex in the frame may cause the shock to collide with the frame.  We would recommend against fitting X2.

Push* - Once upon a time Push made an ElevenSix SS (side stack) with offset adjusters and a perpendicular reservoir which allowed the shock to clear the frame.  Any other generation of the ElevenSix will not fit.

Marzocchi* - We are yet to confirm whether the Marzocchi Bomber Air is compatible.

Fast* - Only the standard Fenix Enduro (not Evo) shock with a perpendicular reservoir will fit.  


REMEDY

 

HARDWARE

MY

Start

MY

End

Travel

Eye-to-eye

Stroke

Mount-kit U/F

Mount-kit

L/R

Notes

2014

2016

140

197

57

10x40

8x40

27.5

2014

2016

140

197

55

10x40

8x40

29

2017

2017

150

230

57.5

10x60

8/10x50 Offset

Lower bolt size depends on the model

2018

2018

150

230

57.5

10x54/60

8/10x50 Offset

Lower bolt size depends on the model

2019

2022

150

230

57.5

10x54/60

10x50 Offset

 

 

BOLTS

Lower Shock Axle – 540755           Upper Shock Axle – 540755

Additional bolts are only required for Thru-Shaft to standard shock conversion.  

 

SHOCK COMPATIBILITY

Brand

Coil

Air

Fox

Yes, all shocks

Yes, all shocks

RockShox

Yes, all shocks

Deluxe (in-line)*

RockShox Flight Attendant

N/A

Yes

DVO

Yes

Yes

Push

*

N/A

Ohlins

Yes

Yes

Intend

N/A

Probs

CaneCreek

Kitsuma Coil

Kitsuma Air

Marzocchi

Yes

Yes

Fast

Yes

N/A

 

RockShox Deluxe* - might not perform very well/ consistently on a long travel ebike due to lower overall oil volume

Push* -  Push do not offer ElevenSix for this frame 


SLASH

 

HARDWARE

MY

Start

MY

End

Travel

Eye-to-eye

Stroke

Mount-kit U/F

Mount-kit

L/R

Notes

2012

2013

160

210

60

10x40

8x40

 

2014

2016

160

210

60

10x40

8x40

 

2017

2020

150

230

57.5

10x54/60

10x50 Offset

 

2021

2022

160

230

62.5

10x54

10x40

 

 

BOLTS

Trek Slash (2021+):

Lower Shock Axle – 5258210        Upper Shock Axle – 5258209

Trek Slash (pre-2021):

Lower Shock Axle – 540755           Upper Shock Axle – 540755

Additional bolts are only required for Thru-Shaft to standard shock conversion.  

 

SHOCK COMPATIBILITY (2021 & NEWER)

Brand

Coil

Air

Fox

Yes, all shocks

Yes, all shocks

RockShox

Yes, all shocks

Deluxe (in-line)*

RockShox Flight Attendant

N/A

Yes

DVO

Yes

Yes

Push

*

N/A

Ohlins

Yes

Yes

Intend

N/A

Probs

CaneCreek

Kitsuma Coil

Kitsuma Air

Marzocchi

Yes

Yes

Fast

Yes

N/A

 

RockShox* - Standard Super Deluxe Air does not fit due to lock-out lever interference in the last 1/3 of the travel 

Push* -  Push do not offer ElevenSix for this frame 


TOP FUEL

 

HARDWARE

MY

Start

MY

End

Travel

Eye-to-eye

Stroke

Mount-kit U/F

Mount-kit

L/R

Notes

2008

2008

100

165

38

8x40

8x22.2

 

2009

2012

100

165

38

8x21.8

8x35.6

 

2016

2016

100

165

38

8x25.4

8x50 Offset

 

2017

2018

100

165

38

10x54

8x50 Offset

 

2020

2021

115

190

45

8x40

8x26

 

2022

-

120

185

50

Trunnion

8x30

 

 

SHOCK COMPATIBILITY (2022 & NEWER)

Brand

Coil**

Air

Fox

DHX, DHX2

DPS, DPX2, Float X

RockShox

Deluxe, Super Deluxe

Yes, all shocks

RockShox Flight Attendant

N/A

No

DVO

Jade

Topaz

Push

*

N/A

Ohlins

*

*

Intend

N/A

*

CaneCreek

*

*

Marzocchi

*

*

Fast

*

N/A

 

Coil Shocks** - this frame is not very progressive and it is much better suited for air shocks

Push* - Push do not offer ElevenSix for this frame

Ohlins Coil* - Only with transverse casting

Ohlins Air* - This shock will likely fit, however, we are yet to confirm this

Intend* - This shock will likely fit, however, we are yet to confirm this

CaneCreek* - We are not sure due to end eye design

Marzocchi Coil* - IFP reservoir will need checking for clearance!

Marzocchi Air* - Similar in design to Float X, however, it still needs checking for clearance

Fast* - Needs checking for clearance at full travel, the Evo version of the shock might not fit


Super Deluxe Thru-Shaft (C1 2021+)


 

The RockShox Super Deluxe Thru-Shaft shock is a proprietary shock designed explicitly for Trek Bikes and not available on any other frame manufacturer’s bikes.  The Thru-Shaft is fitted on a range of Trek frames including the Slash and the Rail.  

Most mountain bike shocks use an internal floating piston (IFP) design. The IFP sits between the oil and gas [typically nitrogen] inside the shock. When you hit a bump, the shock damper shaft displaces the oil as it moves through the shock, pushing against the IFP and compressing the gas below.  The IFP returns to its position when you are over the bump and the oil pressure is reduced. 

The idea behind the Thru-Shaft design is to remove the perceived lag created by using an IFP. Instead, the design introduces a secondary damper rod to account for the change in oil volume, and the damper shaft ‘exits’ the bottom of the shock.  

On paper, it may seem like a great idea, but the Thru-shaft design has suffered reliability issues.  A rod protruding from the shock requires an additional seal to retain the oil in the damping circuit - and in practice, another seal means another point of possible failure.  

As production of these shocks is limited to Trek Frames this product is less well supported in terms of spares and parts than another more widely available/ equivalent suspension.  This means that these shocks are generally more challenging, or sometimes even impossible to service or repair.

On balance and in our experience, the performance and maintenance issues of the Thru-Shaft outweigh the stated benefits of this suspension design.

 

CAN I REPLACE MY ROCKSHOX THRU-SHAFT SHOCK WITH A STANDARD EYELET SUPER DELUXE AIR/ COIL SHOCK?

The frame/ shock clearance varies between frames and frame model years - please refer to the compatibility tables on top of the page for per-frame & model year compatibility.  The reservoir on the Thru-Shaft shock is placed much higher, towards the upper eyelet (trunnion), and offset to one side in relation to the IFP reservoir on a standard Super Deluxe to improve the frame clearance.  See the image below for a comparison.

CAN I REPLACE MY ROCKSHOX THRU-SHAFT SHOCK WITH A DIFFERENT TRUNNION?

No, not without drastically affecting the bike’s geometry. Despite the Thru-Shaft shock using trunnion mounts, it is a 230mm eye-to-eye shock.  See the image below for a comparison.