Wednesday 5 December 2012

Build a versatile performance bike: 2. frame and wheels

The performance mainly comes from bicycle's frame and wheel set. The frame's geometry and material both play importance role in it's performance. 

the geometry of the frame can be described in the last photo in the post. the seat tube length(D) represents the size of the frame. usually Head tube angle(A), seat tube angle(B) and stay length determines if the bike is aggressive or leisure style. other size changes proportionally.  Roughly, more straight seat tube ( say 75 degree angle) and shorter rear wheel to the seat tube distance, more efficient riding due the designed riders position and resulting bike's stiffness. more comfortable other wise.



The geometry of this frame usually can be seen in the entry level race bike, and the material of the frame, which is chromoly steel , is stiff enough also supposed to provide more comfortable riding. 



the wheel consists of white industries oversize hub laced with Mavic open pro rims.  The hub was designed for rough condition such as touring and unpaved road usage but with race hub's lightness and ultra smoothness. the rims are also strong and light. the wheel set is versatile enough to be training or touring wheels. Hub is 8-9 speed compatible, while I configure it as single speed for daily use.


Based on this frame and wheel set,  the idea is to get ride of all none-sense to achieve the simplicity, elegance hence the performance. if needed, with cassette and bar end shifter, it can be easy converted to the multi-geared touring bike for long distance.  





A   Head Tube Angle
B   Seat Tube Angle
C   Top Tube Length
D   Seat Tube Length              
E   Chainstay Length              
F   Bottom Bracket Drop  
G   Fork Offset
H   Total Fork Length    
I    Head Tube Length              
J   Wheelbase

2 comments:

  1. You really like tinkering with bikes, eh? I used to wax my own skis but not any more.

    ReplyDelete