The SDI Terrain Master 2.1 rear shock replaces the factory rear shocks on the 2019+ Can-Am Defender HD10 with a 64-inch width, giving work and trail owners adjustable compression, a piggyback reservoir and rebuildable internals in place of basic emulsion shocks. It is the rear half of SDi's 64" Defender HD10 Terrain Master 2.1 package, so you can upgrade one axle at a time or pair it with the matching front shock set for the full setup.
SDi built the Terrain Master 2.1 because the typical UTV comes with low end emulsion shocks that are over sprung and offer little performance. These Can-Am Defender shocks use high flow pistons, a low friction piggyback reservoir, quality seals and bushings, and an oversized compression adjuster, which makes them a practical Can-Am Defender suspension upgrade for owners who haul, plow, work and trail ride the same machine. Note the width: SDi sells separate 64" and 65" versions of this Defender HD10 part.
As a Can-Am Defender shock upgrade, these Defender rear shocks bolt in with the stock hardware and add clicker-adjustable compression for a loaded bed.
SDI Suspension (Suspension Direct) builds these SDI shocks as a direct replacement, not a long travel kit. Compared with other aftermarket UTV shocks, Terrain Master UTV rear shocks are one of the simplest UTV shocks upgrades for SxS shocks that ride harsh, and SDi offers the same side by side shocks platform for other utility machines.
Key Features
- Large bore compression adjuster for an optimized frequency response and adjustment range, with SDi's click guide of 1-5 clicks for heavy loads, 6-10 for sportier performance and 11-15 for comfort
- Billet aluminum T6 high flow pistons with low opening forces and a sensitive frequency response
- Low friction piggyback reservoir that helps dissipate heat for consistent damping
- Race style quick adjust preload ring locked by a 4 mm socket head screw (maximum preload 1.5 in / 40 mm)
- Machined, anodized aluminum internals with no plastic inside the shock
- Induction hardened shafts with hard chrome coating to resist pitting and wear
- Super high tensile lightweight springs, barrel formed for bow resistance
- PTFE lined 28 mm spherical bearings with sealed spacers
- 3-piece fully rebuildable seal head for quick maintenance
- Zero Fade Fluid now standard, per SDi
Built To Solve: Harsh Ride And Fade On The 64" Defender HD10
- Factory emulsion shocks that feel over sprung and harsh on washboard roads and rutted farm trails
- Damping that fades as the stock shocks heat up on long rough runs
- No way to tune the rear end for a loaded bed, plow work or an empty cruise
- Worn stock shocks that cannot be rebuilt, versus a 3-piece fully rebuildable seal head
Best For: 64" Can-Am Defender HD10 Owners Upgrading Shocks
- 2019+ Can-Am Defender HD10 and Defender MAX HD10 owners whose machine measures 64 inches wide
- Ranch, farm and utility owners who carry weight in the bed and want adjustable compression
- Trail riders who want better control than the stock shocks without moving to long travel
- Owners building the full SDi package one axle at a time (add the rear, then the front shock set)
- Not for long travel builds: SDi designs Terrain Master 2.1 for standard travel UTVs
Specifications
- Included: the SDI Terrain Master 2.1 rear shock for the 64" Defender HD10, as listed by SDi's distributor. SDi does not publish the piece count for this rear-only part number; contact Dunes 2 Dezert SXS to confirm quantity before ordering. SDi's complete Defender kit includes a rear sway bar relocator; it is not listed for this rear-only part, so do not assume it is included.
- Position: rear
- Vehicle width: 64" Can-Am Defender HD10 (a separate 65" version exists)
- Installed spring length per SDi chart: rear 12 in
- SDi preload setting, 2-seat 64": 1.0 in
- SDi preload setting, 4-seat 64": 1.25 in
- SDi ride height range for the 64" Defender: 10.25 to 13.25 in (dependent on wheel and tire size)
- Product line: SDI Terrain Master 2.1 (TM2.1) passive shocks, designed for standard travel UTVs
- Reservoir: low friction piggyback
- Compression adjustment: large bore compression adjuster (clicker)
- Pistons: billet aluminum T6, high flow
- Shafts: induction hardened, hard chrome coated
- Bearings: PTFE lined 28 mm spherical bearings with sealed spacers
- Seal head: 3-piece, fully rebuildable
- Springs: super high tensile, lightweight, barrel formed
- Preload: quick adjust ring, maximum 1.5 in (40 mm)
- Shock fluid: Zero Fade Fluid (standard)
- Designed and developed in the US by Suspension Direct (SDi)
- Hardware: SDi's install manual reuses the stock shock bolts and hardware (do not discard them)
- Matching SDi complete front-and-rear kit for this width: STM-SS-2522004
Fitment
- Can-Am Defender HD10, 2019+ (64" width)
- Can-Am Defender MAX HD10, 2019+ (64" width)
SDi lists this application as "Fits 2019+ Can Am 64" Defender HD10." SDi does not publish which Defender HD10 trims or model years are 64 inches versus 65 inches wide, so measure your machine's width before ordering and choose the matching version. SDi does not name Defender PRO or 6x6 models; confirm with us before ordering for those. Fitment is not guaranteed on models, trims or years not listed above.
FAQ
Why are my Can-Am Defender HD10 shocks harsh, and will this rear shock help?
SDi says the typical UTV comes with low end emulsion shocks that are over sprung. The Terrain Master 2.1 replaces them with high flow pistons, a piggyback reservoir and an adjustable compression clicker, so you can set the ride softer for comfort or firmer for load.
How do I know if my Defender HD10 is 64 or 65 inches wide?
SDi makes separate 64" and 65" Defender HD10 versions but does not publish which trims or years are which width. Measure your machine's width before ordering. SDi's chart also lists different ride height ranges: 10.25 to 13.25 in for the 64" and 14.75 to 17.75 in for the 65", depending on wheels and tires.
Does it fit the Defender MAX HD10, and is it set up for 2 or 4 seats?
SDi lists 2019+ 64" Defender HD10 fitment and gives preload settings for both 2-seat and 4-seat machines. SDi's product page says the shocks ship with a four-seat spring setting, while its install manual says the 64" springs are set up for two-seat machines; check and set preload with the chart in the manual after install.
How much preload and compression should I run?
SDi's chart for the 64" rear uses a 12 in spring with 1.0 in preload on a 2-seat machine and 1.25 in preload on a 4-seat machine. Maximum preload is 1.5 in (40 mm). For compression, SDi suggests 1-5 clicks for heavy loads, 6-10 for sportier performance and 11-15 for comfort.
How hard is installation?
Bolt-on. With the machine lifted, remove the lower then upper bolts, fit the shock with the reservoir upside down, facing the rear and inward, and reinstall the stock hardware with blue thread lock torqued to factory spec. SDi's complete kit also relocates the rear sway bar mounts. The SDi installation manual is attached to this listing.
Should I buy this rear shock or the complete SDI Defender HD10 kit?
This listing covers the rear only. If you are replacing all four corners, the matching front shock set or the complete SDi Terrain Master kit (STM-SS-2522004) covers both axles. Upgrading one end at a time works, but matched front and rear damping gives the most balanced ride.
Why SDI
Suspension Direct (SDi) is a suspension manufacturer and parts supplier for motocross and UTV applications. SDi designs and develops the Terrain Master 2.1 in the US to bring real off-road damping to standard travel utility side-by-sides like the Can-Am Defender, with rebuildable internals instead of throwaway shocks.
Complete Your 64" Can-Am Defender HD10 Shock Upgrade
Confirm your Defender HD10 measures 64 inches wide, then add this SDI Terrain Master 2.1 rear shock to your cart. For a balanced ride, pair it with the matching 64" front shock set, and check your bushings, ball joints and A-arm guards while the suspension is apart. Questions on quantity or fitment? Contact Dunes 2 Dezert SXS before you order.
