BSA B50
Gear Ratio Calculation

GEAR SPROCKET	REAR WHEEL SPROCKET	RATIO
11	52	8,7792
11	50	8,4416
11	49	8,2727
11	48	8,1039
11	47	7,9351
14	52	6,8980
14	50	6,6327
14	49	6,5000
15	52	6,4381
14	48	6,3673
14	47	6,2347
15	50	6,1905
15	49	6,0667
16	52	6,0357
15	48	5,9429
15	47	5,8190
16	50	5,8036
16	49	5,6875
17	52	5,6807
16	48	5,5714
17	50	5,4622
16	47	5,4554
18	52	5,3651
17	49	5,3529
17	48	5,2437
18	50	5,1587
17	47	5,1345
19	52	5,0827
18	49	5,0556
18	48	4,9524
19	50	4,8872
18	47	4,8492
19	49	4,7895
19	48	4,6917
19	47	4,5940

BSA B25
Gear Ratio Calculation

GEAR SPROCKET	REAR WHEEL SPROCKET	RATIO
11	52	10,68775
11	50	10,27668
11	49	10,07115
11	48	9,865613
11	47	9,660079
14	52	8,397516
14	50	8,074534
14	49	7,913043
15	52	7,837681
14	48	7,751553
14	47	7,590062
15	50	7,536232
15	49	7,385507
16	52	7,347826
15	48	7,234783
15	47	7,084058
16	50	7,065217
16	49	6,923913
17	52	6,915601
16	48	6,782609
17	50	6,649616
16	47	6,641304
18	52	6,531401
17	49	6,516624
17	48	6,383632
18	50	6,280193
17	47	6,250639
19	52	6,187643
18	49	6,154589
18	48	6,028986
19	50	5,949657
18	47	5,903382
19	49	5,830664
19	48	5,711670
19	47	5,592677

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Updated 22:52 2003-11-25
© RICKARD NEBRÉR