Yamaha TDR 250 Standard Gearing Worksheet
	Values (Enter)	Total Ratio	Minimum Speed	Maximum Speed	Speed at Max Power	Change Down Speed	Change Up Speed	Speed Range	RPM Drop at Change Up	% RPM Drop at Change Up
Primary Drive Ratio	2.545		(KPH)	(KPH)	(KPH)	(KPH)	(KPH)	(KPH)	(RPM)	(% RPM)
1st Gear Ratio	2.571	21.032	0	56	50	N/A	22	22	0	0.0
2nd Gear Ratio	1.750	14.316	12	82	74	49	33	-16	1277	31.9
3rd Gear Ratio	1.316	10.765	16	109	98	66	44	-22	992	24.8
4th Gear Ratio	1.083	8.859	20	133	119	80	53	-27	708	17.7
5th Gear Ratio	0.962	7.870	22	149	134	90	60	-30	447	11.2
6th Gear Ratio	0.852	6.970	25	169	152	101	N/A	51	457	11.4
Front Sprocket (Teeth)	14	3.214
Rear Sprocket (Teeth)	45
Wheel Rim Size (Inches)	17
Tyre Width (MM)	120	Gear	(MPH)	(MPH)	(MPH)	(MPH)	(MPH)	(MPH)	(RPM)	(% RPM)
Tyre Depth (%)	80	1st Gear	0	35	31	N/A	14	14	0	0.0
Engine Minimum RPM	1,500	2nd Gear	8	51	46	31	21	-10	1277	31.9
Engine Maximum RPM	10,000	3rd Gear	10	68	61	41	27	-14	992	24.8
Change Down RPM	6,000	4th Gear	12	83	75	50	33	-17	708	17.7
Change Up RPM	4,000	5th Gear	14	93	84	56	37	-19	447	11.2
Maximum Power RPM	9,000	6th Gear	16	105	95	63	N/A	32	457	11.4
Original Excel worksheet downloaded from http://www.dropbears.com/u/utilities/gearing.htm