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 Carburetor                
Carburetor Info
Del 'Orto Carburetor: Basic Principles Adobe .pdf
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Tire and Wheel Info
Tire Dismounting/Mounting Techniques
Birel 50mm axle chart
 

Here is a list from softest to hardest.

S - 50x2x1040 --- White -- 335
B - 50x2x1000 --- Blue ---- 348
B - 50x2x1040 --- Blue ---- 362
D - 50x2x1000 --- Silver --- 392
D - 50x2x1040 --- Silver --- 407
F - 50x2x1000 --- Yellow -- 435
F - 50x2x1040 --- Yellow -- 452
D - 50x2.5x1040 - Silver --- 494
M - 50x2x1000 --- Red ----- 522
M - 50x2x1040 --- Red ----- 543
K - 50x2x1000 --- Green -- 740
K - 50x2x1040 --- Green -- 769

 

 

Shifter Gear Ratio Chart

Axle

Gear

Counter Shaft Gear

X

 14 15 16 17 18 19 20
18 1.286 1.200 1.125 1.059 1.000 0.947 0.900
19 1.357 1.267 1.188 1.118 1.056 1.000 0.950
20 1.429 1.333 1.250 1.176 1.111 1.053 1.000
21 1.500 1.400 1.313 1.235 1.167 1.105 1.050
22 1.571 1.467 1.375 1.294 1.222 1.158 1.100
23 1.643 1.533 1.438 1.353 1.278 1.210 1.150
24 1.714 1.600 1.500 1.412 1.333 1.263 1.200
25 1.786 1.667 1.563 1.471 1.389 1.316 1.250
26 1.857 1.733 1.625 1.529 1.444 1.368 1.300
27 1.929 1.800 1.688 1.588 1.500 1.421 1.350
28 2.000 1.867 1.750 1.647 1.556 1.473 1.400
29 2.071 1.933 1.813 1.706 1.611 1.526 1.450

   

.900 = 1.222 = 18/22 1.412 = 17/24 1.643 = 14/23

.947 =

1.235 = 17/21 1.421 = 19/27 1.647 = 17/28
.950 = 20/19 1.250 = 16/20 1.429 = 14/20 1.667 = 15/25
1.000 = 18/18 1.250 = 20/25 1.438 = 16/23 1.688 = 16/27
1.000 = 19/19 1.263 = 19/24 1.444 = 18/26 1.706 = 17/29
1.000 = 20/20 1.267 = 15/19 1.450 = 20/29 1.714 = 14/24
1.050 = 20/21 1.286 = 14/18 1.467 = 15/22 1.733 = 15/26
1.053 = 19/20 1.278 = 18/23 1.471 = 17/25 1.750 = 16/28
1.056 = 18/19 1.294 = 17/22 1.474 = 19/28 1.786 = 14/25
1.059 = 17/18 1.300 = 20/26 1.500 = 14/21 1.800 = 15/27
1.100 = 20/22 1.313 = 16/21 1.500 = 16/24 1.813 = 16/29
1.105 = 19/21 1.316 = 19/25 1.500 = 18/27 1.857 = 14/26
1.111 = 18/20 1.333 = 15/20 1.526 = 19/29 1.867 = 15/28
1.125 = 16/18 1.333 = 18/24 1.529 = 17/26 1.929 = 14/27
1.150 = 20/23 1.350 = 20/27 1.533 = 15/23 1.933 = 15/29
1.158 = 19/22 1.353 = 17/23 1.556 = 18/28 2.000 = 14/28
1.167 = 18/21 1.357 = 14/19 1.563 = 16/25 2.071 = 14/29
1.177 = 17/20 1.368 = 19/26 1.571 = 14/22  
1.188 = 16/19 1.375 = 16/22 1.588 = 17/27  
1.200 = 20/24 1.389 = 18/25 1.600 = 15/24  
1.200 = 15/18 1.400 = 15/21 1.611 = 18/29  
1.211 = 19/23 1.400 = 20/28 1.625 = 16/26  

 

 

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