SDI
SDI Steering Knuckles, Hubs, and Suspension Parts at JJ Motorsports
SDI is a specialized brand in the powersports industry, focusing on heavy-duty steering and suspension components for UTVs such as Polaris RZR, Can-Am Maverick, Talon, and Commander. Emphasizing superior strength, lightweight designs, and race-proven performance, SDI products replace weak stock parts to improve safety, handling, and durability in off-road and racing environments.
At JJ Motorsports, we offer a wide range of SDI products, including the race-proven Steering Knuckle - Race Edition for reduced bump steer, the lightweight Heavy Duty Front Hub for Polaris RZR to minimize rotating mass, the adjustable Tie Rods for Talon R with flats for easy tuning, the modular Radius Rods - 64" for enhanced strength, the flexible Accessory Mount Clamp that rotates on impact, and the rigid Motor Mount for Polaris to reduce flex and wear. Whether you're prepping for races or rugged trails, SDI delivers reliable upgrades compatible with major UTV brands. Explore our selection to find the perfect additions for your vehicle.
Browse our in-stock inventory below with same-day shipping and expert support. Free shipping on orders over $99! Questions? Contact us for fitment advice!
- Product
- Qty in Cart
- Quantity
- Price
- Subtotal
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SDI Shock Spring - RZR XP1K Four Seater UDCSKP-1K4
SDI
$899.95Stock RZR suspension geometry wasn't designed to handle the demands of aggressive trail riding, jumping, or multi-passenger loads without excessive body roll and bottoming. The SDI Shock Spring kit...13120910- SKU:
- 13120910
- Availability:
- Ships Same Business Day
- Weight:
- 37.85 LBS
$899.95 -
SDI Shock Spring - RZR XP1K/WER XP Turbo Four Seater UDCSKP-1K417
SDI
$899.95If you're running a Walker Evans-equipped RZR XP1K or WER XP Turbo Four Seater, suspension geometry matters—and this dual-rate spring setup delivers measurable improvements in handling and comfort...13120911- SKU:
- 13120911
- Availability:
- Ships Same Business Day
- Weight:
- 38.70 LBS
$899.95 -
SDI Shock Spring - Talon R UDCSKP-HTR
SDI
$899.95If you're running a Walker Evans suspension setup on your Talon R, spring tuning is where chassis dynamics come down to the finest details. This dual-rate spring system addresses the three biggest...13120912- SKU:
- 13120912
- Availability:
- Ships Same Business Day
- Weight:
- 33.15 LBS
$899.95 -
SDI Shock Spring - Talon X4 USCSKP-HTX4
SDI
$899.95The SDI Shock Spring - Talon X4 delivers a true dual-rate suspension setup that transforms how your RZR handles aggressive terrain. By utilizing both tender and main springs in concert, you'll...13120913- SKU:
- 13120913
- Availability:
- Ships Same Business Day
- Weight:
- 0.01 LBS
$899.95 -
SDI Shock Spring - RZR XP Turbo Four Seater UDCSKP-T
SDI
$949.95If you're running a Walker Evans-equipped RZR XP Turbo Four Seater, suspension geometry matters—and this dual-rate spring setup is engineered to deliver measurable improvements in handling and...13120914- SKU:
- 13120914
- Availability:
- Ships Same Business Day
- Weight:
- 43.90 LBS
$949.95 -
SDI Shock Spring - RZR XP Turbo Two Seater UDCSKP-T2
SDI
$949.95If you're running a Walker Evans suspension setup on your RZR XP Turbo Two Seater, this shock spring kit transforms your ride quality and handling characteristics. The dual-rate spring design...13120915- SKU:
- 13120915
- Availability:
- Ships Same Business Day
- Weight:
- 40.35 LBS
$949.95 -
SDI Shock Spring - RZR Turbo S (Fox) UDCSKP-TS
SDI
$949.95Stock RZR Turbo S suspension struggles with body roll and dive under aggressive driving, limiting your confidence in technical terrain. This dual-rate spring system transforms your Fox shocks into a...13120916- SKU:
- 13120916
- Availability:
- Ships Same Business Day
- Weight:
- 44.75 LBS
$949.95 -
SDI Shock Spring - RZR Turbo S Velocity UDCSKP-TSV2
SDI
$949.95If you're running a Walker Evans suspension setup on your RZR Turbo S Velocity, the factory spring package simply won't deliver the precision tuning your machine demands. The SDI Shock Spring kit...13120917- SKU:
- 13120917
- Availability:
- Ships Same Business Day
- Weight:
- 46.40 LBS
$949.95 -
SDI Shock Spring - RZR Turbo S Velocity Four Seater UDCSKP-TSV4
SDI
$949.95If you're running a Walker Evans suspension setup on your RZR Turbo S Velocity Four Seater, shock spring tuning directly impacts how your machine handles rough terrain and aggressive driving. This...13120918- SKU:
- 13120918
- Availability:
- Ships Same Business Day
- Weight:
- 49.20 LBS
$949.95 -
SDI Shock Spring - X3/RS UDCSKP-X3RS
SDI
$949.95If you're running a RZR with Walker Evans shocks, you know that suspension tuning can make or break your performance on rough terrain. The SDI Shock Spring delivers a true dual-rate setup that...13120919- SKU:
- 13120919
- Availability:
- Ships Same Business Day
- Weight:
- 61.35 LBS
$949.95 -
SDI Shock Spring - X3/RS Max UDCSKP-X3RSMAX
SDI
$949.95If you're running a Walker Evans equipped RZR, suspension geometry matters—and stock spring rates won't cut it for serious terrain. The SDI Shock Spring X3/RS Max delivers a true dual-rate setup that...13120920- SKU:
- 13120920
- Availability:
- Ships Same Business Day
- Weight:
- 66.15 LBS
$949.95 -
SDI Shock Spring - RZR XP1K Two Seater UDCSKHD-1K2
SDI
$799.95If you're running a Walker Evans-equipped RZR XP1K Two Seater, suspension geometry matters—and a poorly tuned spring rate will cost you in handling precision and comfort. The SDI Shock Spring...13120921- SKU:
- 13120921
- Availability:
- Ships Same Business Day
- Weight:
- 36.42 LBS
$799.95 -
SDI Shock Spring - RZR XP1K Two Seater UDCSKHD-1K217
SDI
$899.95If you're running a Walker Evans-equipped RZR XP1K, suspension geometry is everything—and OEM springs simply can't deliver the tuning precision that serious off-road driving demands. The SDI Shock...13120922- SKU:
- 13120922
- Availability:
- Ships Same Business Day
- Weight:
- 38.99 LBS
$899.95 -
SDI Shock Spring - RZR XP1K Four Seater UDCSKHD-1K4
SDI
$899.95The SDI Shock Spring kit transforms your RZR XP1K Four Seater's handling by delivering a true dual-rate suspension setup that actively manages body roll, nose dive, and bottoming—issues that...13120923- SKU:
- 13120923
- Availability:
- Ships Same Business Day
- Weight:
- 38.58 LBS
$899.95 -
SDI Shock Spring - RZR XP Turbo Four Seater UDCSKHD-T
SDI
$949.95If you're running a Walker Evans suspension setup on your RZR XP Turbo Four Seater, a properly tuned shock spring package is critical to controlling weight transfer, minimizing body roll, and...13120924- SKU:
- 13120924
- Availability:
- Ships Same Business Day
- Weight:
- 45.82 LBS
$949.95 -
SDI Shock Spring - RZR XP Turbo (WER)/XP1K Four Seater UDCSKHD-TW
SDI
$899.95If you're running a Walker Evans suspension setup on your RZR XP Turbo or XP1K Four Seater, shock spring tuning is where precision handling gets dialed in. The SDI Shock Spring delivers a true...13120925- SKU:
- 13120925
- Availability:
- Ships Same Business Day
- Weight:
- 17.50 LBS
$899.95 -
SDI Clutch Alignment Tool - Main Crossmembers DTPZRCAT-1K
SDI
$115.95Proper clutch alignment is non-negotiable when assembling or rebuilding your drivetrain—misalignment causes premature wear, vibration, and catastrophic failure. The SDI Clutch Alignment Tool ensures...38030220- SKU:
- 38030220
- Availability:
- Ships Same Business Day
- Weight:
- 8.60 LBS
$115.95Qty in Cart: 0Quantity:Price:$115.95Subtotal: -
SDI Clutch Alignment Tool - Engine Shaft DTPZRCAT-E900
SDI
$69.95Misaligned clutch shafts introduce unnecessary wear on your drivetrain and compromise the precision your build demands. The SDI Clutch Alignment Tool ensures your motor and transmission shafts are...38030222- SKU:
- 38030222
- Availability:
- Ships Same Business Day
- Weight:
- 1.35 LBS
$69.95 -
SDI Clutch Alignment Tool - Transmission Shaft DTPZCAT-PXP
SDI
$69.95Proper shaft alignment is non-negotiable when assembling a motor-to-transmission interface—misalignment leads to premature bearing wear, vibration, and catastrophic drivetrain failure. The SDI Clutch...38030223- SKU:
- 38030223
- Availability:
- Ships Same Business Day
- Weight:
- 1.40 LBS
$69.95Qty in Cart: 0Quantity:Price:$69.95Subtotal: -
SDI Clutch Alignment Tool - Transmission Shaft DTPZCAT-T16
SDI
$73.95Proper clutch alignment is non-negotiable when assembling or rebuilding your drivetrain—misalignment causes premature wear, vibration, and potential catastrophic failure. The SDI Clutch Alignment...38030225- SKU:
- 38030225
- Availability:
- Ships Same Business Day
- Weight:
- 1.35 LBS
$73.95 -
SDI Clutch Alignment Tool - Transmission Shaft DTPZCAT-TRB
SDI
$73.95Proper clutch alignment is non-negotiable when reassembling your engine and transmission—misalignment leads to premature wear, vibration, and catastrophic drivetrain failure. The SDI Clutch Alignment...38030226- SKU:
- 38030226
- Availability:
- Ships Same Business Day
- Weight:
- 1.35 LBS
$73.95Qty in Cart: 0Quantity:Price:$73.95Subtotal: -
SDI Clutch Alignment Tool - Engine Shaft DTPZRCAT-E
SDI
$73.95Proper clutch alignment is non-negotiable when assembling or rebuilding a drivetrain—misalignment leads to premature wear, binding, and potential catastrophic failure. The SDI Clutch Alignment Tool...38030227- SKU:
- 38030227
- Availability:
- Ships Same Business Day
- Weight:
- 1.35 LBS
$73.95Qty in Cart: 0Quantity:Price:$73.95Subtotal: -
SDI Free Piston Assembly - 49 mm SDEFFPA-TAC
SDI
$59.95Stock plastic pistons are a liability in high-demand applications—they lack the durability and consistency needed for reliable performance under pressure. The SDI Free Piston Assembly replaces that...04500597- SKU:
- 04500597
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
$59.95 -
SDI Free Piston Assembly - 49 mm SDEFFPA-TAC-SET
SDI
$110.95The SDI Free Piston Assembly upgrades your equipment with a metal construction that outlasts standard plastic alternatives, delivering superior durability under demanding conditions. Pre-assembled...04500598- SKU:
- 04500598
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
$110.95 -
SDI Free Piston Assembly - 48 mm SDEFFPA09
SDI
$62.95The SDI Free Piston Assembly is engineered to deliver superior durability and reliability where plastic alternatives fail under sustained load. This 48 mm unit arrives fully assembled and ready to...04500599- SKU:
- 04500599
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
$62.95Qty in Cart: 0Quantity:Price:$62.95Subtotal: -
SDI Free Piston Assembly - 48 mm SDEFFPA09-SET
SDI
$110.95If you're running a forced induction system or air suspension setup, your piston assembly experiences extreme pressure cycles that demand metal-to-metal construction and precision engineering. The...04500600- SKU:
- 04500600
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
$110.95Qty in Cart: 0Quantity:Price:$110.95Subtotal: -
SDI Fork Preload Spacer - 5 mm SDEFSP05
SDI
$6.95Fine-tuning your suspension geometry shouldn't require a complete fork disassembly. The SDI Fork Preload Spacer gives you quick, repeatable preload adjustments on twin-chamber forks without breaking...04500601- SKU:
- 04500601
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
$6.95 -
SDI Fork Preload Spacer - 10 mm SDEFSP10
SDI
$5.95Adjusting fork preload shouldn't require specialized tools or professional intervention—the SDI Fork Preload Spacer gives you precise control over suspension stiffness with a simple, bolt-on...04500602- SKU:
- 04500602
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
$5.95 -
SDI Fork Preload Spacer - 2.5 mm SDEFSP25
SDI
$6.95Fork preload directly affects your suspension's initial spring rate and ride height—get it wrong, and you're fighting poor handling and premature wear. The SDI Fork Preload Spacer gives you the...04500603- SKU:
- 04500603
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
$6.95 -
SDI Fork Preload Spacer - 5 mm SDEFSP25-05
SDI
$5.95Twin chamber forks demand precise preload adjustment to dial in the perfect ride height and spring rate for your specific setup. The SDI Fork Preload Spacer eliminates guesswork and eliminates the...04500604- SKU:
- 04500604
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
$5.95 -
SDI Fork Preload Spacer - 10 mm SDEFSP25-10
SDI
$6.95Adjusting fork preload shouldn't require special tools or disassembly of your suspension. The SDI Fork Preload Spacer gives you precise, repeatable preload adjustments on twin-chamber forks with a...04500605- SKU:
- 04500605
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
$6.95 -
SDI Spring Perch Set - CRF SDETCV23SET
SDI
$144.95If you're running a CRF and hitting the limits of stock suspension geometry, this spring perch set transforms how your bike handles deep compressions and aggressive riding. By allowing you to dial in...04500607- SKU:
- 04500607
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
$144.95 -
SDI Spring Perch Set - YZ250F/450F SDETCV24-MX-SET
SDI
$104.95If your YZ250F or YZ450F is bottoming out on bigger hits or washing out through rough terrain, a properly tuned spring perch directly impacts how your suspension responds under load. This set lets...04500608- SKU:
- 04500608
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
$104.95Qty in Cart: 0Quantity:Price:$104.95Subtotal: -
SDI Spring Perch Set SDETCV24-SET
SDI
$104.95Suspension geometry directly impacts how your bike handles under load and through the stroke. The SDI Spring Perch Set SDETCV24-SET gives you the tuning capability to dial in optimal bottoming...04500609- SKU:
- 04500609
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
$104.95 -
SDI Spring Perch Set SDETCV25-SET
SDI
$110.95Fine-tuning suspension geometry is critical for maximizing both comfort and control across varied terrain, and the SDI Spring Perch Set SDETCV25-SET delivers the adjustability you need without...04500610- SKU:
- 04500610
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
$110.95 -
SDI Spring Perch Set - KTM/Husqvarna SDETCVWP
SDI
$104.95If you're running out of suspension travel on aggressive terrain or experiencing harsh bottoming on deep compressions, the SDI Spring Perch Set addresses these issues directly by optimizing your...04500611- SKU:
- 04500611
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
$104.95 -
SDI Spring Perch Set - YZ250F/450F SDETCV18-MXSET
SDI
$110.95Suspension geometry directly impacts how your YZ handles across different terrains—and a quality spring perch set is essential for dialing in the performance you need. The SDI Spring Perch Set gives...04500612- SKU:
- 04500612
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
$110.95 -
SDI Spring Perch Set - YZ250F/450F SDETCVY18-SET
SDI
$110.95Suspension geometry directly impacts your bike's stability and comfort, especially during aggressive riding or rough terrain. The SDI Spring Perch Set lets you dial in your YZ250F/450F's suspension...04500613- SKU:
- 04500613
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
$110.95 -
SDI DU Piston Bushing Conversion Kit - 50 mm DRPBK-KTB50
SDI
$19.95Stock piston wear bands deteriorate rapidly under damping cycles, causing friction buildup and inconsistent suspension response within the first few hours of use. The SDI DU Piston Bushing Conversion...04500615- SKU:
- 04500615
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
$19.95 -
SDI DU Piston Bushing Conversion Kit - 40 mm DRPBK-SH40
SDI
$19.95Stock piston rings are a compromise between cost and performance—they wear rapidly during initial operation, causing your damping characteristics to shift unpredictably within the first five hours...04500616- SKU:
- 04500616
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
$19.95
