March 28, 2011

High-stiffness and Flexibility – 高剛性と柔軟性

There are huge defferences for the relation between stiffness and flexibility in a frame depenping on each customer. It is interesting.
For example, there are two customers A and B. Customer A wants to have a comfortable and flexible bike. On the other hand, customer B would like to have a high-stiffness frame for his bike. (This is a rough example.) One of their tubing is like below, for instance.

*d – diameter, t – wall-thickness

Customer A - Ti, d-35mm (1.37”), t-0.66mm (0.026”), or Steel, d-28.6mm (1.125”), t-0.5mm (0.019”)

Customer B - Ti, d-43mm (1.7”), t-0.93mm (0.037”), or Steel, d-38.0mm (1.5”), t-0.6mm (0.023”)

(*In this example, both Ti and steel have almost the same relation about the stiffness and weight.)

You can see there is a huge difference of stiffness (and weight, too) between the customer A and B (B has 213% (+113%) stiffness and 174% (+74%) weight compared with A.) . You could also understand that customers have their own ride feeling through the bikes. This couldn’t be designed by adjusting the frame size in a material. Tubing design is one of the interesting and important things for a custom-made frame.


Aさん  Ti, 径35mm、厚0.66mm、あるいはSteel, 径28.6mm、厚0.5mm

Bさん  Ti, 径43mm、厚0.93mm、あるいはSteel, 径38mm、厚0.6mm 



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