The larger inner diameter serves two purposes- 1

The impressive size and power of 1/8 scale buggies combines with drivability to make it a worldwide favorite of R/C racers

4 steps of maximum brake force adjustments

with the built-in differential gear offering smooth cornering

and is designed to minimize bump steer through front suspension movements to maximize performance

Whitz Racing - TLR 22X-4 - HyperLite 2.5MM Titanium Upper Screw Kit, Black COR00170 The larger inner diameter servesWhitz Racing's HyperLite TLR 22X 4 2. 5mm Deep Socket Titanium Screws are made from Grade 5 Titanium. This screw kit is a 58 piece upgrade that includes the screws needed to replace the stock hardware in the upper half of the chassis. Includes: 58 Pieces Total Button Head Screw: (1) M3 X 6 (4) M3 x 10 (4) M3 x 12 (2) M3 x 14 Taper Head Screw: (4) M2. 5 x 3 (16) M3 X 8 (9) M3 x 10 (4) M3 x 12 (2) M3 x 14 (4) M3 x 16 Flat Head Screw: (8) M2. 5 x 8