1GN-IS300 GS350 BRAKE ROTOR SET
Upgrade your braking system with this high-performance 2-piece semi-floating rotor, engineered specifically for precision fitment and durability.
Designed to pair seamlessly with 2006-2024 Lexus GS350 4-piston calipers (found on and GS350 F Sport models), this rotor delivers enhanced stopping power and consistent performance under demanding conditions. Each rotor is heat-treated and cast from high-carbon steel, providing superior strength, improved heat dissipation, and resistance to warping.
Important Fitment Note: This rotor is not a direct replacement for factory GS350 rotors or standard aftermarket options. It features a custom-engineered offset designed exclusively for compatibility with the 1999–2005 IS300 spindle.
If you're looking for a direct replacement rotor for the ISF/GSF model, please refer to our other listings.
Key Features:
2-piece semi-floating rotor design
Compatible with Lexus ISF 4-piston calipers (2006-2024 Lexus GS350)
High-carbon steel construction for durability and heat resistance
Heat-treated for improved performance and longevity
Custom offset for 1999–2005 IS300 spindle fitment
Built for enthusiasts who demand precision and performance, this race rotor is an ideal upgrade for custom brake setups.
These are the standard 2IS IS350 4-pot brakes.
1. 2013+ GS350 F-Sport FRONT CALIPERS
The 2013+ GS350 F-Sport uses a larger Advics 4-pot setup.
These are NOT the same as regular GS350/non-F brakes.
Important:
Uses 14" rotors (356mm)
Direct bolt-on to many Lexus knuckles
Same pad shape as IS350 4-pots
Requires 18"+ wheels
2. IS F FRONT CALIPERS (BREMBO)
The IS F uses true Brembo 6-piston front calipers.
Model
Caliper Type
Rotor Size
2008-2014 IS F
Brembo 6-piston
360x30mm
Key interchange info:
IS F calipers bolt onto many Lexus platforms
Typically paired with:
2013+ GS350 F-Sport rotors
RC350 F-Sport rotors
IS F OEM rotors are usually NOT used during swaps due to offset/hub differences.
Common swap:
IS F Brembos
GS350 F-Sport 356mm rotors
Direct bolt-on to:
3IS
4GS
RC
Some older IS chassis with adapters
3. GS F / RC F FRONT CALIPERS
The GS F and RC F share the newer-generation Brembo setup.
Model
Caliper Type
APES Rotor Size
GS F
Brembo 6-piston
380x34mm
RC F
Brembo 6-piston
380x34mm
These are:
Larger than IS F brakes
Require:
19"+ wheels usually
Larger rotors
Dust shield trimming
NOT directly interchangeable with IS F rotors/calipers without matching components.
4. INTERCHANGEABILITY SUMMARY
A. IS350 ↔ GS350 F-Sport
Item
Interchange?
Notes
Calipers
YES
Bolt pattern compatible
Rotors
NO
GS F-Sport uses larger 356mm
Pads
YES
Same pad profile
Brake lines
Usually YES
Minor variations possible
The GS350 F-Sport calipers are basically a spaced-out larger version of the IS350 4-pots.
B. IS F Brembos ↔ GS350 F-Sport Rotors
Item
Interchange?
IS F calipers + GS350 F-Sport rotors
YES
IS F calipers + IS350 rotors
NO
IS F rotors on GS350 F-Sport calipers
NO
This is the most common OEM Lexus BBK swap.
C. GS F / RC F ↔ IS F
Item
Interchange?
Notes
Calipers
Physically similar
Different sizing
Rotors
NO
GSF/RCF are 380mm
Wheels
Different clearance
Usually 19"+ required
5. IS300 BBK SWAPS
Swap
APES 2 Piece Rotor Used
Notes
IS350 4-pot upgrade
334mm IS350
GS350 F-Sport upgrade
356mm GS rotor
IS F Brembo swap
GS350 F-Sport 356mm
GS F / RC F swap
380mm
6. QUICK IDENTIFICATION GUIDE
Caliper
Pistons
Easy Visual
IS350
4
Smaller Advics
GS350 F-Sport
4
Larger Advics body
IS F
6
Brembo logo
GS F / RC F
6
Larger Brembo, thicker rotor

