SDI
SDI specializes in high-performance suspension components and tuning parts for motorcycles, ATVs, UTVs and motocross applications. The brand is known for precision-engineered fork service kits, lowering pull rods and suspension linkage systems designed to improve handling and ride control. Its product range supports key categories like motorcycle suspension tuning, fork rebuild kits and off-road suspension upgrades for Yamaha, KTM, Honda and other major platforms.
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Sdi - DRPBK-KYB40 - DU Piston Bushing Conversion Kit - 40 mm
SDI
$19.95Sdi - 04500623 - DU Piston Bushing Conversion Kit - 40 mmFeaturesDesigned to lower friction and create consistent damping for the life of your oilSpecsTypePistonUnitsKitRiding StyleOff-RoadFork Tube...$19.95 -
Sdi - KFSK46 - Fork Service Kit - 46 mm
SDI
$79.95Sdi - 04500626 - Fork Service Kit - 46 mmFeaturesSpecsProduct NameService KitRiding StyleOff-RoadTypeForkUnitsEachFork Tube Diameter Imperial1...$79.95 -
Sdi - SDETCVY18-SET - Spring Perch Set - YZ250F/450F
SDI
$110.95Sdi - 04500613 - Spring Perch Set - YZ250F/450FFeaturesGreatly improves bottoming resistance and deep stroke performanceRequires some modification to suit your needs, comes with guideMade in the U.S...$110.95 -
Sdi - DRPBK-WP36 - DU Piston Bushing Conversion Kit - 36 mm
SDI
$19.95Sdi - 04500618 - DU Piston Bushing Conversion Kit - 36 mmFeaturesDesigned to lower friction and create consistent damping for the life of your oilSpecsTypePistonRiding StyleOff-RoadUnitsKitFork Tube...$19.95 -
Out of stock
Sdi - DRPBK-SH50 - DU Piston Bushing Conversion Kit - 50 mm
SDI
$19.95Sdi - 04500617 - DU Piston Bushing Conversion Kit - 50 mmFeaturesDesigned to lower friction and create consistent damping for the life of your oilSpecsTypePistonFork Tube Diameter Imperial1...$19.95 -
Sdi - SDETCVWP - Spring Perch Set - KTM/Husqvarna
SDI
$104.95Sdi - 04500611 - Spring Perch Set - KTM/HusqvarnaFeaturesGreatly improves bottoming resistance and deep stroke performanceRequires some modification to suit your needs, comes with guideMade in the U...$104.95 -
Sdi - DRPBK-KTB50 - DU Piston Bushing Conversion Kit - 50 mm
SDI
$19.95Sdi - 04500615 - DU Piston Bushing Conversion Kit - 50 mmFeaturesDesigned to lower friction and create consistent damping for the life of your oilSpecsUnitsKitFork Tube Diameter Imperial1...$19.95 -
Out of stock
Sdi - SDETCV24-MX-SET - Spring Perch Set - YZ250F/450F
SDI
$104.95Sdi - 04500608 - Spring Perch Set - YZ250F/450FFeaturesGreatly improves bottoming resistance and deep stroke performanceRequires some modification to suit your needs, comes with guideMade in the U.S...$104.95 -
Sdi - SDEFSP25-10 - Fork Preload Spacer - 10 mm
SDI
$6.95Sdi - 04500605 - Fork Preload Spacer - 10 mmFeaturesMade in the U.S.ASpecsRiding StyleOff-RoadTypeForkProduct NameSpacerFork Tube Diameter Metric10.00...$6.95 -
Out of stock
Sdi - SDEFSP25-25 - Fork Preload Spacer - 2.5 mm
SDI
$6.95Sdi - 04500606 - Fork Preload Spacer - 2.5 mmFeaturesMade in the U.S.ASpecsRiding StyleOff-RoadTypeForkUnitsPairFork Tube Diameter Metric2.50 mmProduct...$6.95 -
Sdi - SDEFSP25 - Fork Preload Spacer - 2.5 mm
SDI
$6.95Sdi - 04500603 - Fork Preload Spacer - 2.5 mmFeaturesMade in the U.S.ASpecsProduct NameSpacerFork Tube Diameter Metric2.50 mmRiding...$6.95 -
Out of stock
Sdi - WFSK48 - Fork Service Kit - 48 mm
SDI
MSRP: $139.95$133.95Sdi - 04500636 - Fork Service Kit - 48 mmFeaturesSpecsRiding StyleOff-RoadTypeForkRiding StyleStreetUnitsEachFork Tube Diameter Imperial1.89''Product NameService...MSRP: $139.95$133.95 -
Out of stock
Sdi - SDEFSP10 - Fork Preload Spacer - 10 mm
SDI
$5.95Sdi - 04500602 - Fork Preload Spacer - 10 mmFeaturesMade in the U.S.ASpecsFork Tube Diameter Metric10.00 mmProduct NameSpacerRiding...$5.95 -
Sdi - SFSK47 - Fork Service Kit - 47 mm
SDI
$74.95Sdi - 04500629 - Fork Service Kit - 47 mmFeaturesSpecsProduct NameService KitUnitsEachFork Tube Diameter Imperial1.85''Riding...$74.95 -
Sdi - SFSK37 - Fork Service Kit - 37 mm
SDI
$74.95Sdi - 04500628 - Fork Service Kit - 37 mmFeaturesSpecsUnitsEachProduct NameService KitRiding StyleOff-RoadTypeForkFork Tube Diameter Imperial1...$74.95 -
Sdi - SDEFFPA-TAC - Free Piston Assembly - 49 mm
SDI
$59.95Sdi - 04500597 - Free Piston Assembly - 49 mmFeaturesImproved designComes assembled with all necessary bushings, o-rings and sealsCompletely rebuildable for serviceMade in the...$59.95 -
Sdi - DRPBK-SH40 - DU Piston Bushing Conversion Kit - 40 mm
SDI
$19.95Sdi - 04500616 - DU Piston Bushing Conversion Kit - 40 mmFeaturesDesigned to lower friction and create consistent damping for the life of your oilSpecsFork Tube Diameter Imperial1.58''Product...$19.95 -
Sdi - SDETCV18-MXSET - Spring Perch Set - YZ250F/450F
SDI
$110.95Sdi - 04500612 - Spring Perch Set - YZ250F/450FFeaturesGreatly improves bottoming resistance and deep stroke performanceRequires some modification to suit your needs, comes with guideMade in the U.S...$110.95 -
Sdi - KSFK48 - Fork Service Kit - 48 mm
SDI
$89.95Sdi - 04500627 - Fork Service Kit - 48 mmFeaturesSpecsRiding StyleOff-RoadTypeForkProduct NameService KitUnitsEachFork Tube Diameter Imperial1...$89.95 -
Out of stock
Sdi - SDETCV24-SET - Spring Perch Set
SDI
$104.95Sdi - 04500609 - Spring Perch SetFeaturesGreatly improves bottoming resistance and deep stroke performanceRequires some modification to suit your needs, comes with guideMade in the U.S...$104.95 -
Out of stock
Sdi - WFSK35-SKF - Fork Service Kit - 35 mm
SDI
$99.95Sdi - 04500633 - Fork Service Kit - 35 mmFeaturesSpecsFork Tube Diameter Imperial1.38''Riding StyleOff-RoadTypeForkUnitsEachProduct NameService...$99.95 -
Sdi - SDEFFPA09-SET - Free Piston Assembly - 48 mm
SDI
$110.95Sdi - 04500600 - Free Piston Assembly - 48 mmFeaturesImproved designComes assembled with all necessary bushings, o-rings and sealsCompletely rebuildable for serviceMade in the USASpecsFork Tube...$110.95 -
Sdi - SDEFSP05 - Fork Preload Spacer - 5 mm
SDI
$6.95Sdi - 04500601 - Fork Preload Spacer - 5 mmFeaturesMade in the U.S.ASpecsProduct NameSpacerFork Tube Diameter Metric5.00 mmRiding...$6.95 -
Out of stock
Sdi - SFSK49 - Fork Service Kit - 49 mm
SDI
$83.95Sdi - 04500631 - Fork Service Kit - 49 mmFeaturesSpecsFork Tube Diameter Imperial1.93''UnitsEachProduct NameService KitRiding StyleOff-RoadTypeForkFitment2015-2016,...$83.95 -
Sdi - DRPBK-WP5016 - DU Piston Bushing Conversion Kit - 50 mm
SDI
$19.95Sdi - 04500621 - DU Piston Bushing Conversion Kit - 50 mmFeaturesDesigned to lower friction and create consistent damping for the life of your oilSpecsFork Tube Diameter Imperial1.97''UnitsKitRiding...$19.95 -
Out of stock
Sdi - DRPBK-KYB46 - DU Piston Bushing Conversion Kit - 46 mm
SDI
$19.95Sdi - 04500614 - DU Piston Bushing Conversion Kit - 46 mmFeaturesDesigned to lower friction and create consistent damping for the life of your oilSpecsTypePistonRiding StyleOff-RoadUnitsKitProduct...$19.95 -
Out of stock
Sdi - DRPBK-WP46XPL - DU Piston Bushing Conversion Kit - 46 mm
SDI
$19.95Sdi - 04500619 - DU Piston Bushing Conversion Kit - 46 mmFeaturesDesigned to lower friction and create consistent damping for the life of your oilSpecsFork Tube Diameter Imperial1.81''UnitsKitRiding...$19.95 -
Sdi - SDETCV25-SET - Spring Perch Set
SDI
$110.95Sdi - 04500610 - Spring Perch SetFeaturesGreatly improves bottoming resistance and deep stroke performanceRequires some modification to suit your needs, comes with guideMade in the U.S.ASpecsRiding...$110.95 -
Sdi - SDEFFPA-TAC-SET - Free Piston Assembly - 49 mm
SDI
$110.95Sdi - 04500598 - Free Piston Assembly - 49 mmFeaturesImproved designComes assembled with all necessary bushings, o-rings and sealsCompletely rebuildable for serviceMade in the USASpecsUnitsSetRiding...$110.95 -
Sdi - SDETCV23SET - Spring Perch Set - CRF
SDI
$144.95Sdi - 04500607 - Spring Perch Set - CRFFeaturesGreatly improves bottoming resistance and deep stroke performanceRequires some modification to suit your needs, comes with guideMade in the U.S...$144.95 -
Out of stock
Sdi - SDEFFPA09 - Free Piston Assembly - 48 mm
SDI
$62.95Sdi - 04500599 - Free Piston Assembly - 48 mmFeaturesImproved designComes assembled with all necessary bushings, o-rings and sealsCompletely rebuildable for serviceMade in the USASpecsFork Tube...$62.95 -
Out of stock
Sdi - SDESBCAKT11-ORG - Bladder Cap - Orange - Husqvarna/KTM
SDI
$143.95Sdi - 13140710 - Bladder Cap - Orange - Husqvarna/KTMFeaturesGreatly reduces friction caused by the stock floating pistonIncreases volume, giving the shock a plusher, more linear feelGreatly...$143.95 -
Out of stock
Sdi - SDESBC52BLU-S - Bladder Cap - Blue - Kawasaki/Yamaha
SDI
$66.95Sdi - 13140702 - Bladder Cap - Blue - Kawasaki/YamahaFeaturesIncreases volume, giving the shock a more linear feelHelps keep shock coolerUses easy-to-service standard Schrader...$66.95 -
Sdi - SDEFSP25-05 - Fork Preload Spacer - 5 mm
SDI
$5.95Sdi - 04500604 - Fork Preload Spacer - 5 mmFeaturesMade in the U.S.ASpecsProduct NameSpacerRiding StyleOff-RoadTypeForkFork Tube Diameter Metric5.00...$5.95 -
Out of stock
Sdi - SDEFFPA-SFF - Free Piston Assembly
SDI
$62.95Sdi - 04500596 - Free Piston AssemblyFeaturesImproved designComes assembled with all necessary bushings, o-rings and sealsCompletely rebuildable for serviceMade in the USASpecsMaterialAluminumProduct...$62.95 -
Sdi - SDESBCAKT11-BLU - Bladder Cap - Blue - Husqvarna/KTM
SDI
$136.95Sdi - 13140709 - Bladder Cap - Blue - Husqvarna/KTMFeaturesGreatly reduces friction caused by the stock floating pistonIncreases volume, giving the shock a plusher, more linear feelGreatly increases...$136.95 -
Sdi - SDESBC52B-S - Bladder Cap - Black - Kawasaki/Yamaha
SDI
$66.95Sdi - 13140700 - Bladder Cap - Black - Kawasaki/YamahaFeaturesIncreases volume, giving the shock a more linear feelHelps keep shock coolerUses easy-to-service standard Schrader...$66.95 -
Sdi - SDECPRKT16-B - Lowering Pull Rod - Black
SDI
$219.95Sdi - 13041063 - Lowering Pull Rod - BlackFeaturesReduces deep stroke harshness and hookCan lower seat up to 5-10 mm on some bikesImproves chassis balancePrecision machined to be lightweight, but...$219.95 -
Sdi - SDECPRKX250-B - Lowering Pull Rod - Black
SDI
$219.95Sdi - 13041064 - Lowering Pull Rod - BlackFeaturesReduces deep stroke harshness and hookCan lower seat up to 5-10 mm on some bikesImproves chassis balancePrecision machined to be lightweight, but...$219.95 -
Sdi - SDESBCAKT16SBLU - Bladder Cap - Blue - Husqvarna/KTM
SDI
$143.95Sdi - 13140713 - Bladder Cap - Blue - Husqvarna/KTMFeaturesGreatly reduces friction caused by the stock floating pistonIncreases volume, giving the shock a plusher, more linear feelGreatly increases...$143.95
SDI Suspension Performance Systems – Motorcycle & Powersports Suspension Tuning, Fork Service Kits & Linkage Components
SDI is a performance-focused brand recognized in the powersports industry for its advanced suspension tuning components and precision-machined upgrade parts. The company develops high-quality solutions such as fork service kits, shock components and linkage systems that improve suspension response, stability and rider control across motocross, enduro and UTV applications. With a strong emphasis on durability and engineering accuracy, SDI products are widely used in both professional racing and recreational off-road environments.
The SDI product lineup includes a wide range of fork service kits, bladder caps, lowering pull rods, linkage arms and shock rebuild components designed for major OEM platforms like Yamaha YZ series, KTM/Husqvarna, Honda CRF and Polaris RZR models. These products create strong internal-link opportunities across categories such as motorcycle suspension parts, fork rebuild kits, shock tuning components and UTV suspension upgrades. Additional solutions like DU piston bushing conversion kits, spring perch sets and floating piston assemblies further expand its presence in advanced suspension tuning systems.
Built for performance and reliability, SDI components are engineered to enhance suspension responsiveness, adjust ride height and optimize handling under demanding riding conditions. Riders benefit from improved traction, better shock absorption and precise suspension tuning for both motocross tracks and off-road terrain. With compatibility across motorcycles, dirt bikes and UTV platforms, SDI continues to be a trusted choice for suspension upgrades, rebuild kits and performance tuning solutions.