Tamiya 1/10th R/C Car Gear Ratio Reference

Go to Belt Drive Chassis

Shaft Drive

TA02 (Internal Ratio = 2.44)
Gear Type	Standard 50529						Speed Tuned 53127
Motor Mount Hole	16	17	18	19	20	21	16	17	18	19	20	16	17
Spur Gear	74T						69T					66T
Pinion Gear	16T	17T	18T	19T	20T	21T	21T	22T	23T	24T	25T	24T	25T
Gear Ratio	11.27	10.61	10.02	9.49	9.02	8.59	8.01	7.64	7.31	7.01	6.73	6.70	6.44

 

TB01 (Internal Ratio = 2.6)

Motor Mount Hole

A

B

C

D

A

B

C

D

A

B

C

D

Spur Gear

61T

58T

55T

Pinion Gear

16T

17T

18T

19T

19T

20T

21T

22T

22T

23T

24T

25T

Gear Ratio

9.91

9.33

8.81

8.35

7.94

7.54

7.18

6.85

6.50

6.22

5.96

5.72

 

TB02 (Internal Ratio = 2.6)
Motor Mount Hole	A	B	C	D	A	B	C	D	A
Spur Gear	61T				58T				55T
Pinion Gear	19T	20T	21T	22T	22T	23T	24T	25T	25T
Gear Ratio	8.35	7.93	7.55	7.21	6.85	6.56	6.28	6.03	5.72

 

TT01 (Internal Ratio = 2.6) (Spur Gear = 61T)
Pinion Gear	19T	20T	21T	22T
Gear Ratio	8.35	7.93	7.55	7.21

 

TL01
Gear Type	Standard (Internal Ratio = 3.87)			Speed Tuned (Internal Ratio = 2.9)
Pinion Gear	19T	21T	23T	19T	21T	23T
Gear Ratio	7.96	7.20	6.57	5.95	5.39	4.92

 

TB Evo III (Internal Ratio = 2.6)
	Pinion Gear	34	35	36	37	38	39	40	41	42	43	44	45	46	47	48	49	50	51
Gear Ratio	90T Spur	6.88	6.69	6.50	6.32	6.16	6.00	5.85	5.71	5.57	5.44	5.32	5.20	5.09	4.98	4.88	4.78	4.68	4.59
	96T Spur	7.34	7.13	6.93	6.75	6.57	6.40	6.24	6.09	5.94	5.80	5.67	5.55	5.43	5.31	5.20	5.09	4.99	-

 

TB Evo 4 (Internal Ratio = 2.29)
	Pinion Gear	30	31	32	33	34	35	36	37	38	39	40	41	42	43	44	45	46	47	48	49	50	51
Gear Ratio	90T Spur	-	-	6.45	6.26	6.07	5.90	5.76	5.58	5.43	5.29	5.16	5.04	4.92	4.80	4.69	4.59	4.49	4.39	4.30	4.21	4.13	4.05
	96T Spur	7.34	7.10	6.88	6.67	6.48	6.29	6.12	5.95	5.80	5.65	5.51	5.37	5.24	5.12	5.01	4.89	4.79	4.69	4.59	4.49	4.40	4.32

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Belt Drive

TA03F/R Pro & TRF (Internal Ratio = 2.68)
Pinion Gear	20	21	22	23	24	25	26	27	28	29
Gear Ratio	8.44	8.01	7.67	7.34	7.03	6.75	6.49	6.25	6.03	5.82

 

TA03F/R (Internal Ratio = 2.77)
Pinion Gear	12	13	14	15	16	17	18	19	20	21	22	23	24	25
Gear Ratio	9.93	9.16	8.51	7.94	7.44	7.00	6.62	6.22	5.96	5.67	5.41	5.18	4.96	4.76

 

TA04 (Internal Ratio = 2.13)
Spur Gear	128T							120T										112T
Pinion Gear	34	35	36	37	38	39	40	39	40	41	42	43	44	45	46	47	48	48	49	50	51
Gear Ratio	8.03	7.80	7.59	7.38	7.19	7.00	6.83	6.56	6.40	6.24	6.10	5.95	5.82	5.69	5.57	5.45	5.33	4.98	4.88	4.78	4.68

 

TRF415 (Internal Ratio = 2.1875, Spur Gear = 102T)
Pinion Gear	23	24	25	26	27	28	29	30	31	32	33	34	35	36
Gear Ratio	9.70	9.30	8.93	8.58	8.26	7.97	7.69	7.44	7.20	6.97	6.76	6.56	6.38	6.20
Pinion Gear	37	38	39	40	41	42	43	44	45	46	47	48	49	50
Gear Ratio	6.03	5.87	5.72	5.58	5.44	5.31	5.19	5.07	4.96	4.85	4.75	4.65	4.55	4.46

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Thanks to Peter for collating this information.