[python] Re: Evolution Bike
- From: Tihamer Juhasz <balamber@xxxxxxxxx>
- To: python@xxxxxxxxxxxxx
- Date: Wed, 27 Mar 2013 14:33:34 +0200
Hi Jürgen,
I see. So optimum BB height is somewhere around seat height. As your say,
too low should be bad indeed for aerodynamics and pushing the rider up in
the seat.
Thanks.
Tiha
On Wed, Mar 27, 2013 at 1:32 PM, Jürgen Mages <jmages@xxxxxx> wrote:
> Hi Tiha,
>
> first argument pro high BB is better aerodynamics and second is better
> force input.
>
> I once rode the airbike which has a low BB. Especially when climbing, the
> applied pedalling force is pushing my body up from the seat.
>
> Jürgen.
>
>
> On 27.03.2013 12:14, Tihamer Juhasz wrote:
>
>> Hi,
>>
>> Please enlighten me. Why is a low BB compared to the seat a problem? Until
>> now I thought that a BB should go as low as possible, as long as the heels
>> don't hit the wheel or the ground when turning. A low BB has the
>> advantages
>> that pushing down from the higher seat is easier especially for climbing
>> compared to pushing upwards.
>> Furthermore when the BB is low, the angle between the steering axis and
>> imaginary line between the BB and the seat (the line along which you push
>> the pedal) is shallower and thus the pedal induced steering effect is
>> weaker.
>> These are two advantages of the low BB I know of. What are the
>> disadvantages?
>>
>> I think that this steering angle will not work good in practice indeed.
>>
>> Best, Tiha
>>
>>
>>
>> On Wed, Mar 27, 2013 at 1:04 PM, Jürgen Mages <jmages@xxxxxx> wrote:
>>
>> Design is indeed nice and clean. Performance would be not so good. BB is
>>> too low compared to the seat and even worse: the steering angle is too
>>> small which causes the front wheel to flop in curves.
>>>
>>> Jürgen.
>>>
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