Gearing Ratio Calculator

	A	B	C	D	E	F	G	H	I	J	K	L	M	N	O	P	Q
1	L2RR Gear Ratio Calculator - Download to play with it
2	Enter only in cells with Yellow. Blue cells are calculated.
3	Maximum	11,000	RPM						Chain length calculation - requires front and rear sprocket sizes
4	Tyre	180	width					Chain pitch		525	(428,520,525 etc)
5	Tyre	55	aspect ratio				Countershaft to axle dist:					Approximate #
6	Wheel Diameter	17	inches					Shortest possible		520	mm	95.6	links	N.B. Chain length is always divisible
7	Overall Ratio	0	leave 0 if gear ratios known					Longest possible		570	mm	101.8	links	by 2 - round up
8	The gear ratios must be completed if you leave Final Drive empty
9	Primary drive	1.52	between crank & clutch					Changed front sprocket				Changed Rear Sprocket
10				Known		Overall	Max	14	15	17	18	16	16	16	16	Front
11		Driving	Driven	Ratio	Ratio	Ratio	Speed	43	43	43	43	41	42	44	45	Rear
12	1st gear	13	36	0	2.769	11.312	115	100	108	122	129	120	117	112	110
13	2nd gear	13	26	0	2.000	8.170	159	139	149	169	179	167	163	155	152
14	3rd gear	15	24	0	1.600	6.536	199	174	186	211	223	208	203	194	190
15	4th gear	19	26	0	1.368	5.590	232	203	218	247	261	244	238	227	222
16	5th gear	22	27	0	1.227	5.013	259	227	243	275	291	272	265	253	247
17	6th gear	23	26	0	1.130	4.618	281	246	264	299	316	295	288	275	269
18	Final Drive	16	43	0	2.688
19	Tyre Circumerence	77.897	inches
20	RPM @ KPH	20	KPH increments		10%	over Max RPM
21		20	40	60	80	100	120	140	160	180	200	220	240	260	280	300	320
22	1st gear	1,917	3,834	5,751	7,668	9,585	11,502	0	0	0	0	0	0	0	0	0	0
23	2nd gear	1,384	2,769	4,153	5,538	6,922	8,307	9,691	11,076	0	0	0	0	0	0	0	0
24	3rd gear	1,108	2,215	3,323	4,430	5,538	6,645	7,753	8,860	9,968	11,076	12,183	0	0	0	0	0
25	4th gear	947	1,895	2,842	3,789	4,736	5,684	6,631	7,578	8,525	9,473	10,420	11,367	0	0	0	0
26	5th gear	850	1,699	2,549	3,398	4,248	5,097	5,947	6,796	7,646	8,495	9,345	10,195	11,044	11,894	0	0
27	6th gear	783	1,565	2,348	3,130	3,913	4,695	5,478	6,260	7,043	7,825	8,608	9,390	10,173	10,955	11,738	0
28	Speed @ RPM	1,000	RPM increments
29		1,000	2,000	3,000	4,000	5,000	6,000	7,000	8,000	9,000	10,000	11,000	12,000	0	0	0	0
30	1st gear	10	21	31	42	52	63	73	83	94	104	115	125	0	0	0	0
31	2nd gear	14	29	43	58	72	87	101	116	130	144	159	173	0	0	0	0
32	3rd gear	18	36	54	72	90	108	126	144	163	181	199	217	0	0	0	0
33	4th gear	21	42	63	84	106	127	148	169	190	211	232	253	0	0	0	0
34	5th gear	24	47	71	94	118	141	165	188	212	235	259	283	0	0	0	0
35	6th gear	26	51	77	102	128	153	179	204	230	256	281	307	0	0	0	0
36	Errors may creep in from the tire calculations. skewing the speed calculations such as brand of tyre, tyre pressure, temperature, expansion at speed etc
37	For instance, if you mount a 200 tire on too narrow of a rim, the calculation to compute the tire circumference will be inaccurate,
38	Calculations came from:		http://woodsware.aciwebs.com/gears/gears.asp							Sample is Honda 900 Hornet.