How to Improve your MTB Coil Spring Suspension

Sprindex is compatible with a wide variety of shocks.

There are three different Sprindex lengths and strokes available, and each Sprindex coil can be adjusted through a certain spring rate range. Be sure to use the correct included adapter as described. Make sure that the spring length fits on your shock and that your maximum shock travel is not more than the specified Sprindex coil travel.

IF YOUR SHOCK IS NOT LISTED IN THE BELOW COMPATIBILITY TABLE:

Determine what your shock's stroke is and then compare that to the available Sprindex coils. Sometimes, you can find the stroke specification on the website of your bike brand for your bike model. The stroke printed on your existing coil is a clue, but it might have more stroke than your shock actually needs. Or, just measure the stroke per the picture above. Ideally, choose the Sprindex coil that has at least the amount of stroke that your shock requires, and then measure whether that Sprindex coil overall length can fit between your shock's flanges. The Sprindex coil lengths are listed in the below compatibility table. Note that most shocks can only achieve about 5mm less than their listed stroke because the bottom-out bumper can only be compressed so far, so in most cases it is okay if the Sprindex coil has up to about 3mm less stroke than your shock's stroke rating.

Find your shock on the below table and note which Sprindex family you need.

Shock Brand/Model	Regular or Trunnion	Shock eye to eye	Stroke	Metric / English	Sprindex spring family (stroke x length)
Fox DHX2		230 mm	60 mm	metric	65 x142
Fox DHX2		230 mm	65 mm	metric	65 x 142
Fox DHX2	Trunnion	205mm	60mm	metric	65 x 142
Fox DHX2	Trunnion	205mm	65mm	metric	65 x 142
Fox DHX2		8.5 inch	2.5 inch	English	65 x 142
Fox DHX2		8.75 inch	2.75 inch	English	65 x 142
Fox DHX2		7.875 inch	2.0 inch	English	55 x 126
Fox DHX2		7.875 inch	2.25 inch	English	55 x 126
Fox DHX2		210 mm	50mm	metric	55 x 126
Fox DHX2		210 mm	52mm	metric	55 x 126
Fox DHX2		210 mm	55mm	metric	55 x 126
Fox DHX2	Trunnion	185mm	55mm	metric	55 x 126
Fox DHX2		9.5 inch	3 inch	English	75 x 162
Fox DHX2 Fox DHX2	Trunnion	250mm 225mm	75mm 75mm	metric metric	75 x 162 75 x 162
Shock Brand/Model	Regular or Trunnion	Shock eye to eye	Stroke	Metric / English	Sprindex spring family (stroke x length)
MRP Hazzard		230 mm	65 mm	metric	65 x 142
MRP Hazzard		230 mm	60 mm	metric	65 x 142
MRP Hazzard		230 mm	57.5 mm	metric	65 x 142
MRP Hazzard	Trunnion	205 mm	65 mm	metric	65 x 142
MRP Hazzard	Trunnion	205 mm	60 mm	metric	65 x 142
MRP Hazzard	Trunnion	205 mm	57.5 mm	metric	65 x 142
MRP Hazzard		200mm	51mm	metric	55 x 126
MRP Hazzard		200mm	57mm	metric	55 x 126
MRP Hazzard		210mm	50mm	metric	55 x 126
MRP Hazzard		210mm	55mm	metric	55 x 126
MRP Hazzard		9.5 inch	3 inch	English	55 x 126
Shock Brand/Model	Regular or Trunnion	Shock eye to eye	Stroke	Metric / English	Sprindex spring family (stroke x length)
Marzocchi 2019 Bomber CR		230 mm	60 mm	metric	65 x 142
Marzocchi 2019 Bomber CR		230 mm	65 mm	metric	65 x 142
Marzocchi 2019 Bomber CR	Trunnion	205 mm	60 mm	metric	65 x 142
Marzocchi 2019 Bomber CR	Trunnion	205 mm	65 mm	metric	65 x 142
Marzocchi 2019 Bomber CR		7.875 inch	2.0 inch	English	55 x 126
Marzocchi 2019 Bomber CR		7.875 inch	2.25 inch	English	55 x 126
Marzocchi 2019 Bomber CR		210mm	50mm	metric	55 x 126
Marzocchi 2019 Bomber CR		210mm	55mm	metric	55 x 126
Marzocchi 2019 Bomber CR	Trunnion	185mm	52.5mm	metric	55 x 126
Marzocchi 2019 Bomber CR	Trunnion	185mm	55	metric	55 x 126
Marzocchi 2019 Bomber CR		250mm	75mm	metric	75 x 162
Shock Brand/Model	Regular or Trunnion	Shock eye to eye	Stroke	Metric / English	Sprindex spring family (stroke x length)
DVO Jade Coil		230 mm	65 mm	metric	65 x 142
DVO Jade Coil		230 mm	62.5 mm	metric	65 x 142
DVO Jade Coil		230 mm	60 mm	metric	65 x 142
DVO Jade Coil		230 mm	57.5 mm	metric	65 x 142
DVO Jade Coil	Trunnion	205 mm	65 mm	metric	65 x 142
DVO Jade Coil	Trunnion	205 mm	62.5 mm	metric	65 x 142
DVO Jade Coil	Trunnion	205 mm	60 mm	metric	65 x 142
DVO Jade Coil	Trunnion	205 mm	57.5 mm	metric	65 x 142
DVO Jade Coil		210mm	50mm	metric	55 x 126
DVO Jade Coil		210mm	52.5mm	metric	55 x 126
DVO Jade Coil		210mm	55mm	metric	55 x 126
DVO Jade Coil	Trunnion	185	50	metric	55 x 126
DVO Jade Coil	Trunnion	185	52.5	metric	55 x 126
DVO Jade Coil	Trunnion	185	55	metric	55 x 126
DVO Jade Coil		250 mm	70 mm	metric	75 x 160
DVO Jade Coil		250 mm	75 mm	metric	75 x 162
DVO Jade Coil	Trunnion	225mm	70mm	metric	75 x 162
DVO Jade Coil	Trunnion	225mm	75mm	metric	75 x 162
Shock Brand/Model	Regular or Trunnion	Shock eye to eye	Stroke	Metric / English	Sprindex spring family (stroke x length)
X-Fusion Vector Coil HLR		222 mm /8.75 in	69 mm	Metric/English	65 x 142
X-Fusion Vector Coil HLR		200mm	57mm	metric	55 x 126
X-Fusion Vector Coil HLR		240mm	76mm	metric	75 x 160
Shock Brand/Model	Regular or Trunnion	Shock eye to eye	Stroke	Metric / English	Sprindex spring family (length x stroke)
Cane Creek DB coil CS		222 mm	63 mm	Metric	65 x 142
Cane Creek DB coil CS		222 mm	66 mm	Metric	65 x 142
Cane Creek DB coil CS	Trunnion	205mm	57.5mm	Metric	65 x 142
Cane Creek DB coil CS	Trunnion	205mm	60mm	Metric	65 x 142
Cane Creek DB coil CS	Trunnion	205mm	65mm	Metric	65 x 142
Cane Creek DB coil CS		230mm	57.5mm	Metric	65 x 142
Cane Creek DB coil CS		230mm	60mm	Metric	65 x 142
Cane Creek DB coil CS		230mm	65mm	Metric	65 x 142
Cane Creek DB coil CS		210mm	50mm	metric	55 x 126
Cane Creek DB coil CS		210mm	52.5mm	metric	55 x 126
Cane Creek DB coil CS		210mm	55mm	metric	55 x 126
Cane Creek DB coil CS		200mm	50mm	metric	55 x 126
Cane Creek DB coil CS		200mm	57mm	metric	55 x 126
Cane Creek DB coil CS	Trunnion	185mm	50mm	metric	55 x 126
Cane Creek DB coil CS	Trunnion	185mm	52.5mm	metric	55 x 126
Cane Creek DB coil CS	Trunnion	185mm	55mm	metric	55 x 126
Cane Creek DB coil CS		250mm	70mm	metric	75 x 162
Cane Creek DB coil CS		250mm	75mm	metric	75 x 162
Cane Creek DB coil CS	Trunnion	225mm	70mm	metric	75 x 162
Cane Creek DB coil CS	Trunnion	225mm	75mm	metric	75 x 162
Cane Creek DB coil IL		210mm	50mm	metric	55 x 126
Cane Creek DB coil IL		210mm	52.5mm	metric	55 x 126
Cane Creek DB coil IL		210mm	55mm	metric	55 x 126
Cane Creek DB coil IL		200mm	50mm	metric	55 x 126
Cane Creek DB coil IL		200mm	57mm	metric	55 x 126

Marzocchi before 2018, some models					65 x 142
Shock Brand/Model	Regular or Trunnion	Shock eye to eye	Stroke	Metric / English	Sprindex spring family (length x stroke)
Ohlins TTX22 coil		230mm	57.5mm	Metric	65 x 142
Ohlins TTX22 coil		230mm	60mm	Metric	65 x 142
Ohlins TTX22 coil		230mm	65mm	Metric	65 x 142
Ohlins TTX22 coil	Trunnion	205mm	65mm	Metric	65 x 142
Ohlins TTX22 coil		210mm	50mm	metric	55 x 126
Ohlins TTX22 coil	Trunnion	185mm	55mm	metric	55 x 126
Ohlins TTX22 coil		7.87 inch	2.0 inch	English	55 x 126
Ohlins TTX22 coil		7.87 inch	2.25 inch	English	55 x 126
Ohlins TTX22 coil		9.5 inch	3.0 inch	English	75 x 162
Ohlins TTX22 coil	Trunnion	225mm	70mm	metric	75 x 162
Ohlins TTX22 coil	Trunnion	225mm	75mm	metric	75 x 162
Shock Brand/Model	Regular or Trunnion	Shock eye to eye	Stroke	Metric / English	Sprindex spring family (stroke x length)
Rockshox Super Deluxe Coil RCT		230mm	60mm	metric	65 x 142
Rockshox Super Deluxe Coil RCT		230mm	65mm	metric	65 x 142
Rockshox Super Deluxe Coil RC World Cup		230mm	60mm	metric	65 x 142
Rockshox Super Deluxe Coil RT Remote		230mm	60mm	metric	65 x 142
Rockshox Super Deluxe Coil RT Remote		230mm	65mm	metric	65 x 142
Rockshox Super Deluxe Coil R		230mm	60mm	metric	65 x 142
Rockshox Super Deluxe Coil R		230mm	65mm	metric	65 x 142
Rockshox Super Deluxe Coil RCT	Trunnion	205mm	57.5mm	metric	65 x 142
Rockshox Super Deluxe Coil RCT	Trunnion	205mm	60mm	metric	65 x 142
Rockshox Super Deluxe Coil RCT	Trunnion	205mm	65mm	metric	65 x 142
Rockshox Super Deluxe Coil RCT		210mm	55mm	metric	55 x 126
Rockshox Super Deluxe Coil RT Remote		200mm	57mm	metric	55 x 126
Rockshox Super Deluxe Coil RC World Cup		250mm	75mm	metric	75 x 162
Rockshox Super Deluxe RC	Trunnion	225mm	70mm	metric	75 x 162
Rockshox Super Deluxe RC	Trunnion	225mm	75mm	metric	75 x 162

Shock Brand/Model	Regular or Trunnion	Shock eye to eye	Stroke	Metric / English	Sprindex spring family (stroke x length)
Rockshox Vivid		200	57		55 x 126
Rockshox Vivid		216	63		65 x 142
Rockshox Vivid		222	70		65 x 142
Rockshox Vivid		240	76		75 x 162

Push			2.25 inch	English	55 x 126
Push			2.5 inch	English	65 x 142

Extreme Racing
EXT STORIA LOK V3		200	57	English	55 x 126
EXT STORIA LOK V3		217	63.5	English	65 x 142
EXT STORIA LOK V3		222	67	English	65 x 142
EXT STORIA LOK V3		210	50	Metric	55 x 126
EXT STORIA LOK V3		210	52.5	Metric	55 x 126
EXT STORIA LOK V3		210	55	Metric	55 x 126
EXT STORIA LOK V3		230	57.5	Metric	65 x 142
EXT STORIA LOK V3		230	60	Metric	65 x 142
EXT STORIA LOK V3		230	62.5	Metric	65 x 142
EXT STORIA LOK V3		230	65	Metric	65 x 142
EXT STORIA LOK V3		250	67.5	Metric	75 x 162
EXT STORIA LOK V3		250	70	Metric	75 x 162
EXT STORIA LOK V3		250	72.5	Metric	75 x 162
EXT STORIA LOK V3		250	75	Metric	75 x 162
EXT STORIA LOK V3	Trunnion	185	50	Metric	55 x 126
EXT STORIA LOK V3	Trunnion	185	52.5	Metric	55 x 126
EXT STORIA LOK V3	Trunnion	185	55	Metric	55 x 126
EXT STORIA LOK V3	Trunnion	205	57.5	Metric	65 x 142
EXT STORIA LOK V3	Trunnion	205	60	Metric	65 x 142
EXT STORIA LOK V3	Trunnion	205	62.5	Metric	65 x 142
EXT STORIA LOK V3	Trunnion	205	65	Metric	65 x 142
EXT STORIA LOK V3	Trunnion	225	67.5	Metric	75 x 162
EXT STORIA LOK V3	Trunnion	225	70	Metric	75 x 162
EXT STORIA LOK V3	Trunnion	225	72.5	Metric	75 x 162
EXT STORIA LOK V3	Trunnion	225	75	Metric	75 x 162
EXT STORIA LOK		200	57	English	55 x 126
EXT STORIA LOK		217	63.5	English	65 x 142
EXT STORIA LOK		210	50	Metric	55 x 126
EXT STORIA LOK		210	55	Metric	55 x 126
EXT STORIA LOK		230	60	Metric	65 x 142
EXT STORIA LOK		230	65	Metric	65 x 142
DH Racing:
EXT ARMA HBC V3		222	67	Metric	65 x 142
EXT ARMA HBC V3		241	74	Metric	75 x 162
EXT ARMA HBC V3		230	57.5	Metric	65 x 142
EXT ARMA HBC V3		230	60	Metric	65 x 142
EXT ARMA HBC V3		230	62.5	Metric	65 x 142
EXT ARMA HBC V3		230	65	Metric	65 x 142
EXT ARMA HBC V3		250	70	Metric	75 x 162
EXT ARMA HBC V3		250	72.5	Metric	75 x 162
EXT ARMA HBC V3		250	75	Metric	75 x 162
EXT ARMA HBC V3	Trunnion	205	57.5	Metric	65 x 142
EXT ARMA HBC V3	Trunnion	205	60	Metric	65 x 142
EXT ARMA HBC V3	Trunnion	205	62.5	Metric	65 x 142
EXT ARMA HBC V3	Trunnion	205	65	Metric	65 x 142
EXT ARMA HBC V3	Trunnion	225	70	Metric	75 x 162
EXT ARMA HBC V3	Trunnion	225	72.5	Metric	75 x 162
EXT ARMA HBC V3	Trunnion	225	75	Metric	75 x 162
EXT ARMA HBC		222	70	Metric	75 x 162
EXT ARMA HBC		241	76	Metric	75 x 162

PERFORMANCE ADAPTERS

Performance Adapters are included. Sprindex coils fit a wide variety of shocks, but you must use the Performance Adapter for most of them. Our Performance Adapters both improve the fit between the coil and your shock and are made of low friction Delrin to improve shock performance by allowing the spring to twist during high deflection. See bottom of Performance Adapter for direction of which adapter you should use. For Rockshox, no adapter is necessary but we recommend you use the Performance Washer Adapter for shock performance.

COIL DIRECTION

The Sprindex coil can be installed in either direction and should be installed in the direction that provides the best adjusting access. If your entire shock has good access, then install the Sprindex with the Dial away from the piggyback for easiest hand access.

ADJUSTING SPRING RATE

To adjust the spring rate, hold the coil with one hand and twist the Dial with your other hand or vice versa. The spring rate value is identified by the printed number on the coil displayed through the Dial opening. Preload is not a substitute for a spring that is too weak.

Metric Spring Rate Conversion

Spring rate is shown in pounds per inch (lb/in) on Sprindex coils. Below is a conversion from lb/in to N/mm.

Lb/in	350	360	370	380	390	400	410	420	430	440	450
N/mm	61	63	65	67	68	70	72	74	75	77	79

Lb/in	460	470	480	490	500	510	520	530	540	550	560
N/mm	81	82	84	86	88	89	91	93	95	96	98

Sprindex allows for tool-free, easy adjustment of your coil's spring rate.

How does Sprindex adjust spring rate?

Coil shocks versus air shocks

Spring rate is different from preload

Sprindex versus "progressive" coils

Shock without coil
Bumper just before being compressed towards end of stroke.

Shock without coil
Bumper compressed at end of stroke.

Performance Adapters

Sprindex is compatible with a wide variety of shocks.

Find your shock on the below table and note which Sprindex family you need.

Metric Spring Rate Conversion

Sprindex allows for tool-free, easy adjustment of your coil's spring rate.

How does Sprindex adjust spring rate?

Coil shocks versus air shocks

Spring rate is different from preload

Sprindex versus "progressive" coils

Shock without coilBumper just before being compressed towards end of stroke.

Shock without coilBumper compressed at end of stroke.

﻿Performance Adapters

Sprindex is compatible with a wide variety of shocks.

Find your shock on the below table and note which Sprindex family you need.

Metric Spring Rate Conversion

Shock without coil
Bumper just before being compressed towards end of stroke.

Shock without coil
Bumper compressed at end of stroke.

Performance Adapters