Sprocket Ratio Chart for Cushman Scooters

Jim's Cushman Scooter Site

MPH vs RPM for Various Gear Ratios

Home Cushman Club Of America Information Jim's Engine Overhaul Manual New Content Technical & Repair Historic Information Cushman Model ID Hints & Tips Vanguard Center Cushman Time Line Cushman Pictures Truckster Pictures Other Scooter Pictures Cushman Dealers Cushman Literature Cushman Clubs Links Page Cushman Show Pictures	Model:	1958 Up Cast Iron Eagle				Springer Eagle			Silver Eagle
	RPM	MPH	MPH	MPH	MPH	MPH	MPH	MPH	MPH	MPH	MPH
	Pri. Ratio	1-1.2	1-1.2	1-1.2	1-1.2	1-1.56	1-1.56	1-1.56	1-1.36	1-1.36	1-1.36
	Sec.Ratio	18-65	19-65	20-65	21-65	21-60	22-60	23-60	18-60	19-60	21-60
	Total Ratio	4.333	4.105	3.9	3.714	4.457	4.25	4.069	4.533	4.295	3.885
	1600	18.6	19.6	20.6	21.6	18	19.8	19.7	17.7	18.7	20.7
	1800	20.9	22.0	23.2	24.3	20.3	21.3	22.2	19.9	21.0	23.3
	2000	23.2	24.5	25.7	27.0	22.5	23.6	24.7	22.2	23.4	25.8
	2200	25.5	26.9	28.3	29.7	24.8	26.0	27.1	24.4	25.7	28.4
	2400	27.8	29.4	30.9	32.4	27.0	28.4	29.6	26.6	28.1	31.0
	2600	30.1	31.8	33.5	35.1	29.3	30.7	32.1	28.8	30.4	33.6
	2800	32.5	34.2	36.0	37.9	31.5	33.1	34.6	31.0	32.7	36.2
	3000	34.8	36.7	38.6	40.6	33.8	35.4	37.0	33.2	35.1	38.8
	3200	35.9	39.1	41.2	43.3	36.0	37.8	39.5	35.4	37.4	41.4
	3400	38.3	41.6	43.8	46.0	38.3	40.2	42.0	37.7	39.7	43.9
	3600	40.6	44.0	46.3	48.7	40.6	42.5	44.4	39.9	42.1	46.5
	3800	42.9	46.5	48.9	51.4	42.8	44.9	46.9	42.1	44.4	49.1
	4000	45.2	48.9	51.5	54.1	45.1	47.3	49.4	44.3	46.8	51.7
	4200	47.5	51.4	54.1	56.8	47.3	49.6	51.8	46.5	49.1	54.3
	4400	49.9	53.8	56.6	59.5	49.6	52.0	54.3	48.7	51.4	56.9
	4600	52.2	56.3	59.2	62.2	51.8	54.3	56.8	51.0	53.8	59.4
	4800	54.5	58.7	61.8	64.9	54.1	56.7	59.2	53.2	56.1	62.0
	5000	56.8	61.2	64.4	67.6	56.3	59.1	61.7	55.4	58.5	64.6
	5200	59.1	63.6	66.9	70.3	58.6	61.4	64.2	57.6	60.8	67.2
	5400	62.6	66.0	69.5	73.0	60.8	63.8	66.6	59.8	63.1	69.8

Standard secondary ratio in bold

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