FAQs

Coil shocks include a threaded ring for preloading the coil. Preloading causes the coil to partially compressed, which requires a higher initial force to start coil movement. Too much preload causes:

1.  Poor small bump absorption resulting in a harsh ride and poor traction.

2.  Poor solution to a coil bottoming out because preload will still be small compared to the load at full travel.

3.  Increased stress reduces coil life.

4.  Sometimes reduces full shock travel.

Spring rate is the force required to compress the spring a certain distance. For example, a 400 lb/in spring rate requires 400 pounds of force to compress each inch of the coil, or about 1040 pounds at 2.6 inches of travel. A 450 lb/in spring requires 50 pounds more per inch or about 130 pounds more at 2.6 inches of travel. Preloading a 400 lb/in coil 5mm (maximum typically recommended) is a 79 pound preload, which will prevent small bumps from moving the suspension (destroying small bump sensitivity), yet probably not prevent bottom out on big hits.

Start by following your shock brand's recommended SAG amount and adjust your Sprindex rate as needed. This is only a starting point. Then slide your rubber bottom-out bumper over so that during your ride, you can look to see how far the bumper has moved. If the bumper is not moving as far as possible, then adjust your Sprindex spring rate lower, move the bumper again, and ride more. Ideally, you should get near full shock travel during your ride without bottoming out.

Your Sprindex range is too low for you. You need a higher range Sprindex.

Your Sprindex range is too high for you. You need a lower range Sprindex.

Consider flipping Sprindex the other direction if that would provide better access to the Dial.

If the Sprindex is less than 2 mm too long to install, then carefully squeezing opposite coils slightly together with zip ties sometimes works. Squeeze as little as necessary and wear safety glasses and gloves. If Sprindex is more than 2mm too long, do not install.

Sprindex is made of a Wedge and Dial. The Wedge has a bump on the bottom that fits into a groove in the last coil of the spring. If the Wedge bump dislodges from the coil groove, you can reinstall it by twisting the assembly hard back into place. It will be easier if you first loosen the shock preload ring.

Be sure you are using the correct adapters for your shock. This allows Sprindex to properly fit a wide variety of shock bodies.  Sometimes shocks have different diameters to fit at each end, in which case you should use whichever adapter fits best on each end.

The range depends on a percentage of change.  Twisting the Dial deactivates up to 1/2 active coil.  There are more active coils on the longer stroke springs and thicker wire on our stronger springs.  The range depends on the percentage of active coils reduced and multiplied times the rate of the spring. Coils with fewer coils have a bigger range and coils with stronger spring rates have a bigger range.  Percentage-wise, all springs within a family have about the same range.

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