SD25 Fork Cartridges - F4 Tops
SD25 Fork Cartridges - F4 Tops - Image 2
SD25 Fork Cartridges - F4 Tops - Image 3
SD25 Fork Cartridges - F4 Tops - Image 4

SD25 Fork Cartridges – F4 Tops

From £900.00

Aprilia, BMW, Buell, Cagiva, Ducati, Harley Davidson, Honda, Kawasaki, KTM, Moto Guzzi, MV Agusta, Suzuki, Triumph, Yamaha
1098, 1098 R - Ohlins Fork, 1098 S - Ohlins Fork, 1198, 1198 SP - Ohlins Fork, 1290 Super Adventure S/T/R, 1290 Superduke GT, 1290 Superduke R, 1390 Superduke R, 390 Duke, 600SS, 690 Duke, 748, 748 R - Ohlins Fork, 748 S, 748 SP + SPS, 749, 749 R - Ohlins Fork, 749 S, 750SS, 790 Adventure, 790 Adventure R, 790 Duke, 848, 888 SP - Ohlins, 888 Strada, 890 Duke, 890 Duke R, 890 SMT, 900SS, 916, 916 Biposta, 916 SP + SPS, 950 Supermoto, 990 Superduke, 990 Superduke R, 996, 996 R - Ohlins Fork, 996 S - Ohlins Fork, 998, 998 R - Ohlins Fork, 998 S, 999, 999 R - Ohlins Fork, 999 S - Ohlins Fork, Brutale 800RR, CB1000R, CB1300, CB500 X, CB600F Hornet, CB750 Hornet, CB900F Hornet, CBR1000RR Fireblade, CBR1000RR R Fireblade - Showa Fork, CBR1000RR R SP Fireblade - Ohlins Fork, CBR1100XX Super Blackbird, CBR600 F, CBR600RR, CBR900RR (929) Fireblade, CBR900RR (954) Fireblade, CBR900RR Fireblade, Daytona 600, Daytona 660, Daytona 675, Daytona 675R, Daytona 765 Moto2, Daytona 900, Daytona T595, Daytona T955i, Desert X, Diavel 1200, Diavel 1260, Diavel V4, Diavel V4 S, ER6 N/F, F3 675, F4 1000, F4 750, F800R, F800S, F900R, FJ1200, FJR1300, FXDX Dyna, FZ-1 Fazer, FZ-1N, FZ-6N, FZ-6S Fazer, FZ-8, FZ-S 1000 Fazer, FZR1000 EX-UP, FZR1000 Genesis, FZR400R, FZR400RR SP, FZR600R, FZR750R OWO1, Griso 1200, GSF1200 Bandit, GSF1250 Bandit, GSF600 Bandit, GSX1250 FA, GSX1300 B-KING, GSX1300 HAYABUSA, GSX1400, GSX8 R, GSX8 S, GSX8 TT, GSXR1000, GSXR1000R, GSXR1100 G/H/J, GSXR1100 K, GSXR1100 L/M/N/W, GSXR400, GSXR600, GSXR750, GSXR750 SRAD, GSXS1000, GSXS1000 F, GSXS1000 GT, GSXS750, GT 1000 Classic, GTR1400, H2 Ninja, H2 SX Ninja, Hypermotard 1100, Hypermotard 796, Hyperstrada 820, Katana, M1000RR, M2 Cyclone, Monster 1100, Monster 1100 EVO, Monster 1200, Monster 1200 S - Ohlins, Monster 796, Monster 821, Monster 900, Monster 937, MT-07, MT-07 Tracer, MT-07 Tracer GT, MT-07 Y-AMT, MT-09, MT-09 Tracer, MT-09 Tracer GT, MT-09 Y-AMT, MT-10, MT-10 SP, Multistrada 1200, Multistrada 1200 DVT, NSF250R, Panigale 1199 - Marzocchi Fork, Panigale 1199 R - Ohlins Fork, Panigale 1199 S - Ohlins Fork, Panigale 1299 - Marzocchi Fork, Panigale 1299 R - Ohlins Fork, Panigale 1299 S - Ohlins Fork, Panigale 899, Panigale 959, Panigale V2, Panigale V4 - Showa Fork, Panigale V4 R - Ohlins Fork, Panigale V4 S - Ohlins Fork, R Nine T - USD Fork, R Nine T Pure - RWU Fork, R Nine T Scrambler - RWU Fork, R Nine T Urban GS - RWU Fork, Raptor 1000, RC-R 990, RC390, RC8, RC8 R, RF900, RGV250, Rocket 3, RRV450 Race Bike, RS125, RS125R, RS250, RS250R NX5, RS250R NXA, RS660 - KYB Fork, RS660 - WUXI Fork, RS660 Factory - Ohlins Fork, RST1000 Futura, RSV1000 Mille, RSV1000 Mille R - Ohlins Fork, RSV1000R - Showa Fork, RSV1000R Factory - Ohlins Fork, RSV4 1100 - Sachs Fork, RSV4 1100 Factory - Ohlins Fork, RSV4R - Sachs Fork, RSV4R - Showa Fork, RSV4RR - Ohlins Fork, RSV4RR - Sachs Fork, RSV4RR/RF - Ohlins Fork, RVF400R NC35, RVF750R RC45, S1000R, S1000RR, S3 Thunderbolt, SL1000 Falco, SL750 Shiver, SMV 750 Dorsoduro, SMV 900 Dorsoduro, Speed Triple 1050, Speed Triple 1200RS, Speed Triple 900, Speed Triple 955, Speed Triple 955i, Speed Triple R, Speed Triple S, Speed Triple T509, Speed Twin 1200, Speed Twin 1200 RS, Sport 1000 Classic Biposto, Sport 1000 Classic Monoposto, Sportster, Sprint 900, Sprint RS, Sprint ST, Sprint ST1050, Street Scrambler, Street Triple 675, Street Triple 675R, Street Triple 765R, Street Triple 765R LRH, Street Triple 765RS, Street Triple 765S, Street Twin, Streetfighter 848, Streetfighter V2 955, Streetfighter V4, Supersport, Supersport S, SV1000, SV650, Thruxton 1200, Thruxton 1200R, Thruxton 1200RS, Thruxton 900, Tiger 660 Sport, Tiger 800 Sport, Tiger 900, Tiger 900 Rally Pro, Tiger 955, TL1000R, TL1000S, Tracer 7, Tracer 7 GT, Tracer 9, Tracer 9 GT, Trident 660, Trident 900, Trophy 1200, Trophy 900, TT600, Tuono 1000 - Showa Fork, Tuono 1000R - Ohlins Fork, Tuono 660 - KYB Fork, Tuono 660 Factory - Ohlins Fork, Tuono V4 1100 Factory - Ohlins Fork, Tuono V4 1100 R - Sachs Fork, Tuono V4 R - Sachs Fork, TZ250, V100 Mandello, V7, V85TT, VFR1200 F/FDCT, VFR400R NC30, VFR750 F, VFR750R RC30, VFR800 F Crossrunner, VFR800 F Interceptor, VFR800 F VTEC, VFR800 Fi, VTR1000 F Firestorm, VTR1000 SP1/SP2 RC51, X1 Lightning, XB12S Lightning, XB12X Ulysses, XDiavel, XDiavel S, XJR1300, XL1200 R, XL750 Transalp, XL883N, XR1200 X, XSR700, XSR900, YZF R7, YZF R9, YZF1000 R1, YZF1000 R1M, YZF1000R Thunderace, YZF600 R6, YZF600R Thundercat, YZF750 R7 OWO2, YZF750R, YZF750SP, Z H2, Z H2 SX, Z1000, Z1000 SX, Z650, Z900, Z900 RS, ZRX1100, ZRX1200, ZX-10, ZX-10R Ninja, ZX-10RR Ninja, ZX-12R Ninja, ZX-4RR Ninja, ZX-6R 636 Ninja, ZX-6R Ninja, ZX-6RR Ninja, ZX-7RR, ZX-9R, ZXR400 H, ZXR400 L, ZXR750 H, ZXR750 J/K/L/M, ZZR1100 C/D, ZZR1200, ZZR1400, ZZR600
1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025, 2026, 2027
Category:

All of our products are custom built to your exact specifications ensuring premium performance and quality

Description

Upgrade your motorcycle's front suspension with the SD25 fork cartridges, a high-performance Separate Damping System built for bikes requiring enhanced damping control.
Designed as a larger-volume alternative to the SD20, the SD25 separates damping duties entirely between the fork legs—placing rebound damping in the right leg and compression damping in the left leg. This split layout maximizes oil flow efficiency around fewer orifices, delivering a significantly faster, more responsive damping transition when switching between compression and rebound.
The SD25 cartridges can be installed into any modern upside down or older conventional style forks. On conventional forks the chrome tube has to be 40mm diameter or bigger. If the chrome tubes are smaller than 40mm, then we recommend our SD20 fork cartridges.
The F4 tops were created to reduce the cost compared to the fully adjustable SD25 fork tops. They are separately adjustable for rebound damping and compression damping. There are 20 clicks of adjustment in each. Preload adjustment on F4 fork caps is handled internally via a knurled wheel beneath the fork cap.
The designs of the SD20 and SD25 cartridges are basically the same, apart from the diameter of the piston.
Key Features & Specifications
• Separate Damping System (SDS): Isolates rebound in the right leg and compression in the left leg for superior oil flow efficiency.
• 25mm Piston Design: Bigger piston design for improved damping performance.
• 10mm Diameter Low-Friction Damper Rods: Hard-chromed and polished rods provide an ultra-smooth finish to optimize low-speed fork action.
• Top-Mounted Adjusters: Both rebound and compression adjusters are conveniently located on top of the fork legs, featuring 25 precise clicks for easy, confident tuning.
• Bespoke Silicon Chrome Springs: Custom-matched springs are installed in both legs, tailored specifically to your bike and individual rider weight.
• Durable Alloy Construction: Precision-machined from robust 6082 T6 and 7075 T6 alloys, then hard-anodized to protect sliding components and extend service life.
• Custom-Built to Order: Every kit is individually assembled at the factory to suit your exact machine and riding application.
• USD or Conventional forks: Adaptability to install into almost any fork.

Additional information

Brand

Aprilia, BMW, Buell, Cagiva, Ducati, Harley Davidson, Honda, Kawasaki, KTM, Moto Guzzi, MV Agusta, Suzuki, Triumph, Yamaha
Model

1098, 1098 R – Ohlins Fork, 1098 S – Ohlins Fork, 1198, 1198 SP – Ohlins Fork, 1290 Super Adventure S/T/R, 1290 Superduke GT, 1290 Superduke R, 1390 Superduke R, 390 Duke, 600SS, 690 Duke, 748, 748 R – Ohlins Fork, 748 S, 748 SP + SPS, 749, 749 R – Ohlins Fork, 749 S, 750SS, 790 Adventure, 790 Adventure R, 790 Duke, 848, 888 SP – Ohlins, 888 Strada, 890 Duke, 890 Duke R, 890 SMT, 900SS, 916, 916 Biposta, 916 SP + SPS, 950 Supermoto, 990 Superduke, 990 Superduke R, 996, 996 R – Ohlins Fork, 996 S – Ohlins Fork, 998, 998 R – Ohlins Fork, 998 S, 999, 999 R – Ohlins Fork, 999 S – Ohlins Fork, Brutale 800RR, CB1000R, CB1300, CB500 X, CB600F Hornet, CB750 Hornet, CB900F Hornet, CBR1000RR Fireblade, CBR1000RR R Fireblade – Showa Fork, CBR1000RR R SP Fireblade – Ohlins Fork, CBR1100XX Super Blackbird, CBR600 F, CBR600RR, CBR900RR (929) Fireblade, CBR900RR (954) Fireblade, CBR900RR Fireblade, Daytona 600, Daytona 660, Daytona 675, Daytona 675R, Daytona 765 Moto2, Daytona 900, Daytona T595, Daytona T955i, Desert X, Diavel 1200, Diavel 1260, Diavel V4, Diavel V4 S, ER6 N/F, F3 675, F4 1000, F4 750, F800R, F800S, F900R, FJ1200, FJR1300, FXDX Dyna, FZ-1 Fazer, FZ-1N, FZ-6N, FZ-6S Fazer, FZ-8, FZ-S 1000 Fazer, FZR1000 EX-UP, FZR1000 Genesis, FZR400R, FZR400RR SP, FZR600R, FZR750R OWO1, Griso 1200, GSF1200 Bandit, GSF1250 Bandit, GSF600 Bandit, GSX1250 FA, GSX1300 B-KING, GSX1300 HAYABUSA, GSX1400, GSX8 R, GSX8 S, GSX8 TT, GSXR1000, GSXR1000R, GSXR1100 G/H/J, GSXR1100 K, GSXR1100 L/M/N/W, GSXR400, GSXR600, GSXR750, GSXR750 SRAD, GSXS1000, GSXS1000 F, GSXS1000 GT, GSXS750, GT 1000 Classic, GTR1400, H2 Ninja, H2 SX Ninja, Hypermotard 1100, Hypermotard 796, Hyperstrada 820, Katana, M1000RR, M2 Cyclone, Monster 1100, Monster 1100 EVO, Monster 1200, Monster 1200 S – Ohlins, Monster 796, Monster 821, Monster 900, Monster 937, MT-07, MT-07 Tracer, MT-07 Tracer GT, MT-07 Y-AMT, MT-09, MT-09 Tracer, MT-09 Tracer GT, MT-09 Y-AMT, MT-10, MT-10 SP, Multistrada 1200, Multistrada 1200 DVT, NSF250R, Panigale 1199 – Marzocchi Fork, Panigale 1199 R – Ohlins Fork, Panigale 1199 S – Ohlins Fork, Panigale 1299 – Marzocchi Fork, Panigale 1299 R – Ohlins Fork, Panigale 1299 S – Ohlins Fork, Panigale 899, Panigale 959, Panigale V2, Panigale V4 – Showa Fork, Panigale V4 R – Ohlins Fork, Panigale V4 S – Ohlins Fork, R Nine T – USD Fork, R Nine T Pure – RWU Fork, R Nine T Scrambler – RWU Fork, R Nine T Urban GS – RWU Fork, Raptor 1000, RC-R 990, RC390, RC8, RC8 R, RF900, RGV250, Rocket 3, RRV450 Race Bike, RS125, RS125R, RS250, RS250R NX5, RS250R NXA, RS660 – KYB Fork, RS660 – WUXI Fork, RS660 Factory – Ohlins Fork, RST1000 Futura, RSV1000 Mille, RSV1000 Mille R – Ohlins Fork, RSV1000R – Showa Fork, RSV1000R Factory – Ohlins Fork, RSV4 1100 – Sachs Fork, RSV4 1100 Factory – Ohlins Fork, RSV4R – Sachs Fork, RSV4R – Showa Fork, RSV4RR – Ohlins Fork, RSV4RR – Sachs Fork, RSV4RR/RF – Ohlins Fork, RVF400R NC35, RVF750R RC45, S1000R, S1000RR, S3 Thunderbolt, SL1000 Falco, SL750 Shiver, SMV 750 Dorsoduro, SMV 900 Dorsoduro, Speed Triple 1050, Speed Triple 1200RS, Speed Triple 900, Speed Triple 955, Speed Triple 955i, Speed Triple R, Speed Triple S, Speed Triple T509, Speed Twin 1200, Speed Twin 1200 RS, Sport 1000 Classic Biposto, Sport 1000 Classic Monoposto, Sportster, Sprint 900, Sprint RS, Sprint ST, Sprint ST1050, Street Scrambler, Street Triple 675, Street Triple 675R, Street Triple 765R, Street Triple 765R LRH, Street Triple 765RS, Street Triple 765S, Street Twin, Streetfighter 848, Streetfighter V2 955, Streetfighter V4, Supersport, Supersport S, SV1000, SV650, Thruxton 1200, Thruxton 1200R, Thruxton 1200RS, Thruxton 900, Tiger 660 Sport, Tiger 800 Sport, Tiger 900, Tiger 900 Rally Pro, Tiger 955, TL1000R, TL1000S, Tracer 7, Tracer 7 GT, Tracer 9, Tracer 9 GT, Trident 660, Trident 900, Trophy 1200, Trophy 900, TT600, Tuono 1000 – Showa Fork, Tuono 1000R – Ohlins Fork, Tuono 660 – KYB Fork, Tuono 660 Factory – Ohlins Fork, Tuono V4 1100 Factory – Ohlins Fork, Tuono V4 1100 R – Sachs Fork, Tuono V4 R – Sachs Fork, TZ250, V100 Mandello, V7, V85TT, VFR1200 F/FDCT, VFR400R NC30, VFR750 F, VFR750R RC30, VFR800 F Crossrunner, VFR800 F Interceptor, VFR800 F VTEC, VFR800 Fi, VTR1000 F Firestorm, VTR1000 SP1/SP2 RC51, X1 Lightning, XB12S Lightning, XB12X Ulysses, XDiavel, XDiavel S, XJR1300, XL1200 R, XL750 Transalp, XL883N, XR1200 X, XSR700, XSR900, YZF R7, YZF R9, YZF1000 R1, YZF1000 R1M, YZF1000R Thunderace, YZF600 R6, YZF600R Thundercat, YZF750 R7 OWO2, YZF750R, YZF750SP, Z H2, Z H2 SX, Z1000, Z1000 SX, Z650, Z900, Z900 RS, ZRX1100, ZRX1200, ZX-10, ZX-10R Ninja, ZX-10RR Ninja, ZX-12R Ninja, ZX-4RR Ninja, ZX-6R 636 Ninja, ZX-6R Ninja, ZX-6RR Ninja, ZX-7RR, ZX-9R, ZXR400 H, ZXR400 L, ZXR750 H, ZXR750 J/K/L/M, ZZR1100 C/D, ZZR1200, ZZR1400, ZZR600
Year

1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025, 2026, 2027

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