|
Sunday, 11 February 2007 |
Here is the technical information to determine bike size and bike gearing How do you know what frame you should ride? | | Rider Height | Frame Size | Top Tube Length | Stem Length | HandleBar Rise | Bar Width | Crank Length | Gearing | | 4'0" & under | Micro-Mini | 15"- 15.5" | Mini | 2"-2.5" | 20"- 21.5" | See Chart Below | See Chart Below | | 4'0"-4'6" | Mini | 15.5"- 16.5" | Mini Mini XL | 2"-3.5" | 21"- 23" | See Chart Below | See Chart Below | | 4'4"-4'10" | Junior | 16"- 17.5" | Mini XL Junior | 3"-4.5" | 22"- 24.5" | See Chart Below | See Chart Below | | 4'8"-5'4" | Expert | 17"- 18.5" | Expert / Pro | 4.5"-6" | 24"- 26" | See Chart Below | See Chart Below | | 5'2"-5'8" | Expert XL | 18"-19" | Pro | 6"-7.5" | 26"- 27" | See Chart Below | See Chart Below | | 5'6" - 5'10" | Pro | 18.5"- 19.5" | Pro Pro XL | 7"-8" | 27"- 28" | See Chart Below | See Chart Below | | 5'10"-6'1" | Pro XL | 19"-21" | Pro Pro XL | 7"-8" | 17"- 28" | See Chart Below | See Chart Below | | 6' & over | Pro XXL | 20.5" & over | Pro XL Pro XXL | 7"-8" | 28"- ?" | See Chart Below | See Chart Below |
Stem Lenghts in Millimeters Mini/35mm – 1 inch Steertube | Junior/40mm – 1 inch Steertube | Mini XL/45mm – 1 inch Steertube | Expert/46mm – 1 1/8 inch Steertube | Pro/47mm – 1 1/8 inch Steertube | Pro XL/52mm – 1 1/8 inch Steertube | Cruiser/52mm – 1 1/8 inch Steertube | XXL/60mm – 1 1/8 inch Steertube |
 What is the correct wheel size? | Wheel Sizes | | Maximum rider wieght (lbs) | Rim Width | | 0 – 85 | Sew Ups | | 0 – 100 | 20 x 1-1/8" | | 101 – 120 | 20 x 1-3/8" | | 121 – 150 | 20 x 1.50" | | 151 – 200 | 20 x 1.75" |
What should your Crank size be? | CRANK SIZING CHART | | Riders Inseam | Under 19" | 20" | 21" | 22" | 23" | 24" | 25" | | Crank Length | 135mm | 140mm | 145mm | 150mm | 155mm | 160mm | 162mm | | | | | | | | | | | Riders Inseam | 26" | 27" | 28 to 29" | 30 " | 31" | 32" | 34" | | Crank Length | 166mm | 171mm | 175mm | 180mm | 182mm | 185mm | 190mm |
. What Gear Should you Run? Recommended Rollout for Boys over 9 years old: Novice 57.0 -> 55.0 Intermediate 55.0 -> 53.6 Expert 53.6 -> 52.4 Learning to spin is an essential skill to learn to compete at an expert level. A rider needing to "mash" down on the pedals is not going to be able to get the quick acceleration needed to be competitive. But gearing can be too low as well and they have quick acceleration, but will 'top out' too soon and not have the speed to keep up. It's a matter of finding the right balance. To figure your rotation here is the formula. ** Sprocket divided by Freewheel times Tire diameter ** Note: that your "True or actual" outside tire diameter might be slightly larger or smaller than the tire diameter used in these gear charts below!! (see approx. true/actual tire diameter chart below). Approx. True/Actual Tire diameter | 20" X 1.75" = 19.75 inches inflated | 20" X 1.50" = 19.45 inches inflated | | 20" X 1.3/8" = 20.75 inches inflated | 20" X 1.1/8" = 20 inches inflated | | 24" X 1.75" = 23.75 inches inflated | 24" X 1.50" = 23 inches inflated | | 24" X 1.3/8" = 24.40 inches inflated | 24" X 1.1/8" = 23.75 inches inflated |
Gear Charts | 20" X 1.75" Gear Chart | | Sprocket | 34 | 35 | 36 | 37 | 38 | 39 | 40 | 41 | | Freewheel 14 | 47.4 | 48.7 | 50.2 | 51.6 | 53.0 | 54.4 | 55.7 | 57.1 | | Freewheel 15 | 44.3 | 45.4 | 46.0 | 48.1 | 49.4 | 50.7 | 52.0 | 53.3 | | Freewheel 16 | 41.5 | 42.7 | 43.9 | 45.1 | 46.3 | 47.5 | 48.8 | 50.0 | | Freewheel 17 | 39.0 | 40.2 | 41.3 | 42.5 | 43.6 | 44.7 | 45.9 | 47.0 | | Freewheel 18 | 36.8 | 37.8 | 39.0 | 40.1 | 41.2 | 42.3 | 43.3 | 44.4 | | | | | Sprocket | 42 | 43 | 44 | 45 | 46 | 47 | 48 | | | Freewheel 14 | 58.5 | 59.9 | 61.9 | 62.7 | 64.1 | 65.5 | 66.9 | | Freewheel 15 | 54.6 | 55.9 | 57.2 | 58.5 | 59.8 | 61.1 | 62.4 | | Freewheel 16 | 51.2 | 52.4 | 53.7 | 54.9 | 56.1 | 57.3 | 58.5 | | Freewheel 17 | 48.2 | 49.4 | 50.5 | 51.7 | 52.8 | 53.9 | 55.1 | | Freewheel 18 | 45.5 | 46.6 | 47.7 | 48.8 | 49.9 | 51.0 | 52.0 |
| 20" X 1.50" Gear Chart | | Sprocket | 34 | 35 | 36 | 37 | 38 | 39 | 40 | 41 | | Freewheel 14 | 46.8 | 48.1 | 49.5 | 50.9 | 52.3 | 53.6 | 55.0 | 56.4 | | Freewheel 15 | 43.6 | 44.9 | 46.2 | 47.4 | 48.8 | 50.1 | 51.3 | 52.8 | | Freewheel 16 | 40.9 | 42.1 | 43.3 | 44.5 | 45.7 | 46.9 | 48.1 | 49.3 | | Freewheel 17 | 38.5 | 39.6 | 40.8 | 41.9 | 43.1 | 44.1 | 45.2 | 46.4 | | Freewheel 18 | 36.4 | 37.4 | 38.5 | 39.6 | 40.6 | 41.7 | 42.8 | 43.9 | | | | | Sprocket | 42 | 43 | 44 | 45 | 46 | 47 | 48 | | | Freewheel 14 | 57.5 | 59.1 | 60.5 | 61.8 | 63.2 | 64.6 | 66.0 | | Freewheel 15 | 53.9 | 55.2 | 56.5 | 57.7 | 59.1 | 60.2 | 61.6 | | Freewheel 16 | 50.5 | 51.7 | 52.9 | 54.1 | 55.3 | 56.5 | 57.7 | | Freewheel 17 | 47.5 | 48.7 | 49.8 | 51.0 | 52.2 | 53.1 | 54.3 | | Freewheel 18 | 44.9 | 46.0 | 47.0 | 48.1 | 49.2 | 50.3 | 51.3 |
| 20" X 1.3/8" Gear Chart | | Sprocket | 34 | 35 | 36 | 37 | 38 | 39 | 40 | 41 | | Freewheel 14 | 51.0 | 52.5 | 54.0 | 55.5 | 57.0 | 58.5 | 60.0 | 61.5 | | Freewheel 15 | 47.6 | 49.0 | 50.4 | 51.6 | 53.2 | 54.6 | 56.0 | 57.4 | | Freewheel 16 | 44.6 | 45.9 | 47.3 | 48.6 | 49.9 | 51.2 | 52.5 | 53.9 | | Freewheel 17 | 42.0 | 43.2 | 44.5 | 45.7 | 47.0 | 48.2 | 49.4 | 50.7 | | Freewheel 18 | 39.7 | 40.7 | 42.0 | 43.2 | 44.4 | 45.5 | 46.7 | 47.9 | | | | | Sprocket | 42 | 43 | 44 | 45 | 46 | 47 | 48 | | | Freewheel 14 | 63.0 | 64.5 | 66.0 | 67.5 | 69.0 | 70.5 | 72.0 | | Freewheel 15 | 58.8 | 60.2 | 61.6 | 63.0 | 64.4 | 65.8 | 67.2 | | Freewheel 16 | 55.2 | 56.5 | 57.8 | 59.1 | 60.4 | 61.7 | 63.0 | | Freewheel 17 | 51.9 | 53.2 | 54.4 | 55.6 | 56.9 | 58.1 | 59.3 | Freewheel 18 | 49.0 | 50.2 | 51.4 | 52.5 | 53.7 | 54.9 | 56.0 |
| 20" X 1.1/8" Gear Chart | | Sprocket | 34 | 35 | 36 | 37 | 38 | 39 | 40 | 41 | | Freewheel 14 | 48.6 | 50.0 | 51.4 | 52.8 | 54.3 | 55.7 | 57.1 | 58.6 | | Freewheel 15 | 45.3 | 46.7 | 48.0 | 49.3 | 50.7 | 52.0 | 53.3 | 54.7 | | Freewheel 16 | 42.5 | 43.8 | 45.0 | 46.2 | 47.5 | 48.7 | 50.0 | 51.2 | | Freewheel 17 | 40.0 | 41.2 | 42.3 | 43.5 | 44.7 | 45.9 | 47.0 | 48.2 | | Freewheel 18 | 37.7 | 38.8 | 40.0 | 41.1 | 42.2 | 43.3 | 44.4 | 45.6 | | | | | Sprocket | 42 | 43 | 44 | 45 | 46 | 47 | 48 | | | Freewheel 14 | 60.0 | 61.4 | 62.8 | 64.3 | 65.7 | 67.1 | 68.6 | | Freewheel 15 | 56.0 | 57.3 | 58.7 | 60.0 | 61.3 | 62.7 | 64.0 | | Freewheel 16 | 52.5 | 53.7 | 55.0 | 56.2 | 57.5 | 58.7 | 60.0 | | Freewheel 17 | 49.4 | 50.6 | 51.8 | 52.9 | 54.1 | 55.3 | 56.5 | | Freewheel 18 | 46.7 | 47.8 | 48.9 | 50.0 | 51.1 | 52.2 | 53.3 |
| 24" X 1.75" Gear Chart | | | Sprocket | 34 | 35 | 36 | 37 | 38 | 39 | 40 | 41 | | Freewheel 14 | 58.3 | 60.0 | 61.7 | 63.3 | 65.0 | 66.9 | 68.6 | 70.3 | | Freewheel 15 | 54.4 | 56.0 | 57.6 | 59.3 | 60.7 | 62.4 | 64.1 | 65.5 | | Freewheel 16 | 51.0 | 52.5 | 54.0 | 55.5 | 57.0 | 58.5 | 60.0 | 61.4 | | Freewheel 17 | 48.0 | 49.4 | 50.0 | 52.2 | 53.6 | 55.1 | 56.5 | 57.9 | | Freewheel 18 | 45.3 | 46.5 | 48.0 | 49.4 | 50.7 | 52.0 | 53.3 | 54.7 | | | | | Sprocket | 42 | 43 | 44 | 45 | 46 | 47 | 48 | | | Freewheel 14 | 72.0 | 73.7 | 75.3 | 77.0 | 78.9 | 80.6 | 82.3 | | Freewheel 15 | 67.2 | 68.9 | 70.3 | 72.0 | 73.7 | 75.1 | 76.8 | | Freewheel 16 | 63.1 | 64.5 | 66.0 | 67.4 | 69.1 | 70.5 | 72.0 | | Freewheel 17 | 59.3 | 60.7 | 62.1 | 63.6 | 65.0 | 66.2 | 67.7 | | Freewheel 18 | 56.0 | 57.3 | 58.5 | 60.0 | 61.4 | 62.6 | 64.1 |
| 24" X 1.50" Gear Chart | | | Sprocket | 34 | 35 | 36 | 37 | 38 | 39 | 40 | 41 | | Freewheel 14 | 55.9 | 57.5 | 59.1 | 60.7 | 62.3 | 64.2 | 65.8 | 67.4 | | Freewheel 15 | 52.1 | 53.7 | 55.2 | 56.7 | 58.2 | 59.8 | 61.3 | 62.8 | | Freewheel 16 | 48.4 | 50.3 | 51.8 | 53.2 | 54.6 | 56.0 | 57.5 | 58.9 | | Freewheel 17 | 46.0 | 47.3 | 48.7 | 50.0 | 51.4 | 52.8 | 54.1 | 55.5 | | Freewheel 18 | 43.4 | 44.7 | 46.0 | 47.2 | 48.5 | 49.8 | 51.1 | 52.4 | | | | | Sprocket | 42 | 43 | 44 | 45 | 46 | 47 | 48 | | | Freewheel 14 | 69.0 | 70.6 | 72.2 | 73.8 | 75.7 | 77.3 | 78.9 | | Freewheel 15 | 64.4 | 65.9 | 67.4 | 69.0 | 70.6 | 72.0 | 73.6 | | Freewheel 16 | 60.3 | 61.8 | 63.2 | 64.6 | 66.2 | 67.6 | 69.0 | | Freewheel 17 | 56.8 | 58.8 | 59.5 | 60.8 | 62.3 | 63.5 | 64.8 | | Freewheel 18 | 53.7 | 54.9 | 56.2 | 57.5 | 58.9 | 60.0 | 61.4 |
| 24" X 1.3/8" Gear Chart | | Sprocket | 34 | 35 | 36 | 37 | 38 | 39 | 40 | 41 | | Freewheel 14 | 58.3 | 60.0 | 61.7 | 63.3 | 65.0 | 66.9 | 68.6 | 70.3 | | Freewheel 15 | 54.4 | 56.0 | 57.6 | 59.3 | 60.7 | 62.4 | 64.1 | 65.5 | | Freewheel 16 | 51.1 | 52.5 | 54.0 | 55.5 | 57.0 | 58.5 | 60.0 | 61.4 | | Freewheel 17 | 48.0 | 49.4 | 50.8 | 52.2 | 53.6 | 55.1 | 56.5 | 57.9 | | Freewheel 18 | 45.3 | 46.5 | 48.0 | 49.4 | 50.7 | 52.0 | 53.3 | 54.7 | | | | | Sprocket | 42 | 43 | 44 | 45 | 46 | 47 | 48 | | | Freewheel 14 | 72.0 | 73.7 | 75.3 | 77.0 | 78.9 | 80.6 | 82.3 | | Freewheel 15 | 67.2 | 68.9 | 71.3 | 72.0 | 73.7 | 75.1 | 76.8 | | Freewheel 16 | 63.1 | 64.5 | 66.0 | 67.4 | 69.1 | 70.5 | 72.0 | | Freewheel 17 | 59.3 | 60.7 | 62.1 | 63.3 | 65.0 | 66.2 | 67.7 | | Freewheel 18 | 56.0 | 57.3 | 58.5 | 60.0 | 61.4 | 62.6 | 64.1 |
| 24" X 1.1/8" Gear Chart | | Sprocket | 34 | 35 | 36 | 37 | 38 | 39 | 40 | 41 | | Freewheel 14 | 54.9 | 56.5 | 58.1 | 59.7 | 61.3 | 63.1 | 64.7 | 66.3 | | Freewheel 15 | 51.3 | 52.8 | 54.3 | 55.8 | 57.3 | 58.8 | 60.3 | 61.8 | | Freewheel 16 | 48.1 | 49.5 | 50.9 | 52.3 | 53.7 | 55.1 | 56.6 | 57.9 | | Freewheel 17 | 45.2 | 46.6 | 47.9 | 49.3 | 50.6 | 51.9 | 53.2 | 54.6 | | Freewheel 18 | 42.7 | 43.9 | 45.2 | 46.6 | 47.7 | 49.1 | 50.3 | 51.5 | | | | | Sprocket | 42 | 43 | 44 | 45 | 46 | 47 | 48 | | | Freewheel 14 | 67.9 | 69.4 | 71.0 | 72.6 | 74.4 | 76.0 | 77.6 | | Freewheel 15 | 63.3 | 64.9 | 66.3 | 67.9 | 69.4 | 70.8 | 72.4 | | Freewheel 16 | 59.5 | 60.8 | 62.2 | 63.9 | 65.1 | 66.5 | 67.9 | | Freewheel 17 | 55.9 | 57.2 | 58.6 | 59.9 | 61.3 | 62.4 | 63.8 | | Freewheel 18 | 52.8 | 54.0 | 55.3 | 56.6 | 57.9 | 59.0 | 60.4 |
|
