Honda Gear Ratio Chart

	23 Axle	24 Axle	25 Axle	26 Axle	27 Axle	28 Axle	29 Axle	30 Axle	31 Axle	32 Axle	33 Axle	34 Axle	35 Axle	36 Axle
28 Eng.	4.93	5.14	5.36	5.57	5.79	6.00	6.21	6.43	6.64	6.86	7.07	7.29	7.50	7.71
29 Eng.	4.76	4.97	5.17	5.38	5.59	5.79	6.00	6.21	6.41	6.62	7.83	7.03	7.24	7.45
30 Eng.	4.60	4.80	5.00	5.20	5.40	5.60	5.80	6.00	6.20	6.40	7.60	7.80	7.00	7.20
31 Eng.	4.45	4.65	4.84	5.03	5.23	5.42	5.61	5.81	6.00	6.19	6.39	6.58	6.77	6.97
30 Eng.	4.60	4.80	5.00	5.20	5.40	5.60	5.80	6.00	6.20	6.40	7.60	7.80	7.00	7.20
31 Eng.	4.45	4.65	4.84	5.03	5.23	5.42	5.61	5.80	6.00	6.19	6.39	6.58	6.77	6.97
32 Eng.	4.31	4.50	4.69	4.88	5.06	5.25	5.44	5.68	5.81	6.00	6.19	6.38	6.56	6.75
33 Eng.	4.18	4.36	4.55	4.73	4.91	5.09	5.27	5.45	5.64	5.82	6.00	6.18	6.36	6.55
34 Eng.	4.06	4.24	4.41	4.59	4.76	4.94	5.12	5.29	5.47	5.65	6.82	6.00	6.18	6.35
35 Eng.	3.94	4.11	4.29	4.46	4.63	4.80	4.97	5.14	5.31	5.49	5.66	5.83	6.00	6.17
36 Eng.	3.83	4.00	4.17	4.33	4.50	4.67	4.83	5.00	5.17	5.33	5.50	5.67	6.83	6.00
37 Eng.	3.73	3.89	4.05	4.22	4.38	4.54	4.70	4.86	5.03	5.19	5.35	5.51	5.68	5.84
38 Eng.	3.63	3.79	3.95	4.11	4.26	4.42	4.58	4.74	4.89	5.05	5.21	5.37	5.53	5.68
39 Eng.	3.54	3.69	3.85	4.00	4.15	4.31	4.46	4.62	4.77	4.92	5.08	5.23	5.38	5.54
40 Eng.	3.45	3.60	3.75	3.90	4.05	4.20	4.35	4.50	4.65	4.80	4.95	5.10	5.25	5.40
41 Eng.	3.37	3.51	3.66	3.80	3.95	4.10	4.24	4.39	4.54	4.68	4.83	5.98	5.12	5.27
42 Eng.	3.29	3.73	3.57	3.71	3.86	4.00	4.14	4.29	4.43	4.57	4.71	4.86	5.00	5.14

The gearing formula below relies on the use of the Honda or Deco Gear Ratio Chart. For the formula to work, you will need the following information:

• RPM Desired (Ask Engine Builder or See Dyno Chart)
• RPM Car Ran (From Last Run)
• Current Gear Ratio Being Used In The Car (See Ratio Chart)

What you will get from the formula is a new gear ratio to put into the car to achieve the RPM's that you desire.
RPM Wanted ÷ RPM Ran x Gear Ratio Ran = New Gear Ratio Desired

• Example: 5480 ÷ 5220 x 4.97 = 5.22
• RPM Wanted: 5480
• RPM Ran: 5220
• Current Ratio In Car: 4.97
• New Gear Ratio Needed To Reach 5480: 5.22