ATS B Series Version 1

ATS
B Series Version 1


Benefit of the close ratio gear
Designed to maximize your engine's potential, the ATS Close Ratio Gears keep the RPM change smaller on each gear shift than stock gears. You can take advantage of your Acura or Honda's VTEC engine more effectively with ATS's close Ratio Gears.

ATS Close Ratio Gears replace your stock 1st,3rd, 4th, and 5th gears. Your stock 2nd gear (2.105 gear ratio) is still utilized. The close ratio gears are offered in two versions.


The original version (Version 1) is manufactured for a car which has 160 hp to 220 hp. As your tuning advances, the engine produces more horse power which requires a need for a stronger set

The stock 1st gear can be different depending on your final gear ratio and ATS has developed two 1st gears to suit your car. One is for the final gear ratio of 4.40 and the other is for 4.78 or 4.928 (ATS final).

The ATS 1st gear is exactly same for the Version 1 and the Version 2.

From the top, 3rd, 4th, and 5th for both pictures above. The version 2 (3rd,4th, & 5th) has significantly larger module. The version 2 has 150% to 200 % more bending strength.

Ratio is
Version 1

1st Gear - 3.077

3rd Gear - 1.652

4th Gear- 1.308

5th Gear - 1.033

Note 1: ATS close gear set does not fit B16A or B18 cable transmission.

Note 2: If your transmission is from GSR whose second gear ratio is 1.90, ATS recommends to change the second gear ratio to 2.10 (Integra Type R). To change the 1.9 to 2.1, you need Type R mainshaft and the second gear for the countershaft. Keeping 1.90 2nd gear with our 1.652 3rd might be too close.