The adjustable coil spring
Coil feel. Air adjustability.
Sprindex is a coil spring with a dial. Turn it to change the spring rate and get the right rate for your weight, your bike and your trails, without buying a box of springs.
Takes about 2 minutes
- Fits most coil shocks from the last 5 years
- One spring covers a range of rates
- 2 Year Warranty
Scroll to turn it
Dial in your coil on the trail.
Too soft and it wallows. Too stiff and it skips. Twist the adjuster by hand and set the right rate for your weight and today's trail.
Example: 550 to 610 lb/in. Every Sprindex has its own range.
Find your springThree ways to spring your rear shock
Air
Easy to adjust with a pump. Less supple off the top, and the feel can change on long descents as it heats up.
Standard coil
Supple and consistent from top to bottom. One rate per spring, so changing it means buying another.
Best of both
Sprindex
The supple, consistent feel of coil, with a dial that moves the rate up or down across its range. Find your rate on the trail.
It works great. It's amazing. Honestly, I wouldn't ride a coil if it didn't have [Sprindex] because I think getting stuck in between spring rates is just a really stupid way to make your bike feel bad.
As reviewed by
- Singletracks
- BikeRadar
- Vital MTB
- Bikerumor
“Removes the Achilles heel of coil shocks.”Singletracks
★★★★★
Best coil shock upgrade ever. I really enjoy the ability to dial in on the fly for the perfect set up for each trail. Hitting some fast bumpy DH trails.. adjust for buttery smooth bump compliance... Need a little more support for some big drops or jumps... adjust as you need in one second. Your shock becomes exactly what you need it to be. Couldn't recommend more
★★★★★
This has been the most versatile set up ever for my coil bike. Depending on the terrain or bike parks, I can dial it in very quickly and no need for removal of the shock. I've recommended the Sprindex set up to many people.
★★★★★
Freeeking sicko
Will it fit my shock?
If you run a coil shock from the last five years, almost certainly. All you need to know is your shock's stroke.
- Fox
- RockShox
- Marzocchi
- Cane Creek
- Öhlins
- DVO
- EXT
- Push
- MRP
- X-Fusion
- Vorsprung
How it works
- 1
Find your spring
Tell the finder your shock stroke and either your ideal rate or your weight and bike. It matches you to the right Sprindex in about two minutes.
- 2
Fit it like any coil
It goes on your shock the same way as the spring you're running now.
- 3
Dial it in
Ride, turn the dial, ride again. Firmer for bike park days, softer for rough trails, all on one spring.
Sprindex vs preload
Preload moves your sag. Sprindex changes your spring.
Winding preload onto a standard coil squashes it before you sit on it. Your sag drops, but the spring rate stays the same.
| Preload | Sprindex | |
|---|---|---|
| Sag | Adjusts | Adjusts |
| Spring rate | Stays the same | Firmer or softer |
| Bottom-out support | Barely changes | Changes with the rate |
Use preload for a final tweak. Use Sprindex to get the spring right.
Questions riders ask
I run an air shock. Does Sprindex work for me?
Sprindex fits coil shocks. If you're on air, the finder walks you through your options.
How is this different from adding preload?
Preload only shifts your sag. The spring rate stays the same, so a spring that's too soft or too stiff still rides that way. Sprindex changes the rate itself.
How do I know which one to get?
The finder asks for your shock stroke, then either your ideal rate or your weight, bike type and linkage. It recommends a spring and shows the range it covers.
What does it cost?
$160 USD. One Sprindex covers a range of rates you'd otherwise need several springs to try.
Two minutes to the right spring.
Answer a few questions and we'll match you to your Sprindex.
Find your spring