HKS 24999-AN001 Fine Tune Timing Belt for 1989-2002 Nissan Skyline RB20/25/26DET

Vehicle Fitment

• 1989-1994 Nissan Skyline GT-R (BNR32, 2.6L RB26DETT, AWD)
• 1995-1998 Nissan Skyline GT-R (BCNR33, 2.6L RB26DETT, AWD)
• 1999-2002 Nissan Skyline GT-R (BNR34, 2.6L RB26DETT, AWD)
• 1989-1993 Nissan Skyline GTS-T (HCR32, 2.0L RB20DET, RWD)
• 1993-1998 Nissan Skyline GTS25T (ECR33, 2.5L RB25DET, RWD)
• 1998-2001 Nissan Skyline 25GT-T (ER34, 2.5L RB25DET, RWD)
• 1988-1994 Nissan Cefiro / Laurel (A31/C33, 2.0L RB20DET, RWD)

Fitment Notes

• Compatible with RB20DET, RB25DET, and RB26DETT engine variants
• Replaces OEM timing belt reference number 13028-20P25
• Optimized specifically for use with HKS Slide Cam Pulleys for high-power and high-RPM applications
• Belt color is purple with HKS branding

Features

• H-NBR (Hydrogenated Nitrile Butadiene Rubber) teeth rubber for superior heat and chemical resistance
• Mould-formed tooth profile eliminates external pressure stress - prevents tooth weakening and belt skip under high torque
• Belt strength optimized for each RB engine application to maintain stable tension during heat expansion
• Lightweight EPDM rubber construction reduces rotational mass
• Increased durability at high temperatures found in tuned engine bays
• Improved cold-weather flexibility and friction tolerance over standard OEM belts

Specifications

• Belt Size: 141YS25.4
• Belt Color: Purple (HKS branded)
• Tooth Rubber Material: H-NBR (Hydrogenated Nitrile Butadiene Rubber)
• OEM Cross-Reference: 13028-20P25
• Compatible Engines: RB20DET, RB25DET, RB26DETT

Included Components

• 1x HKS Fine Tune Timing Belt (141YS25.4)

Product Description

The HKS 24999-AN001 Fine Tune Timing Belt is a high-strength OEM replacement belt engineered for Nissan's RB-series inline-six engines - covering RB20DET, RB25DET, and RB26DETT applications across the R32, R33, and R34 Skyline generations, as well as the Cefiro and Laurel platforms. Using H-NBR rubber for the tooth profile and a mould-formed tooth construction, this belt resists the tooth deformation and belt skip that can occur with conventional manufacturing methods under high-torque conditions.

Belt tension stability under heat expansion is a core design priority, making this an ideal upgrade for tuned RB engines that run elevated under-hood temperatures. The Fine Tune Timing Belt is particularly well-suited for pairing with HKS Slide Cam Pulleys, where precise belt engagement and tensile strength are critical for high-RPM operation. It serves as a direct drop-in replacement for OEM part number 13028-20P25.