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18" rear wheel

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18" rear wheel

Post  Onthebrakes on Fri 27 Mar - 20:58

Hi
Has anyone considered or even done it ?
Currently 40 mph is ok 45 harsh 50 painful so short motorway trips a bit awkward

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Re: 18" rear wheel

Post  JohnW on Fri 27 Mar - 22:29

Onthebrakes wrote:Hi
Has anyone considered or even done it ?
Currently 40 mph is ok 45 harsh 50 painful so short motorway trips a bit awkward
The larger tyre will foul the swinging arm, (smallest section 18" tyre is 2.75, standard 17" is 2.50) so it cant be done!!!
Even if it could it would make the bike too overgeared, OK for going down hill or back wind but it will struggle against the wind & up hill. You would end up using 3rd gear a lot of the time.
A better idea may be to fit a larger section 2.75 of 3.00 tyre to the 17" rim. But again it may then be overgeared in certain conditions. Maybe ok if you live in a flat area like the Fens.

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Re: 18" rear wheel

Post  Admin drgaz on Sat 28 Mar - 4:12

Or Holland :d\\'-\\':  I would never ride any thing on a motorway that would not cruise at 70 mph with out having a hand full in reserve Evil or Very Mad  suicide else Evil or Very Mad
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Re: 18" rear wheel

Post  JohnW on Sat 28 Mar - 4:48

Admin drgaz wrote:Or Holland :d\\'-\\':  I would never ride any thing on a motorway that would not cruise at 70 mph with out having a hand full in reserve Evil or Very Mad  suicide else Evil or Very Mad
I got pulled by police on M11 near Cambridge, just hopping from one junction to the next (shortest & quickest route to where i was going) The cops got egg on their face as they thought it was a 50cc & as such I would have been breaking the law. But after finding out it was an 80cc they let me go on my way, but did advise me to keep off motorways as at 45 mph the bike was too slow even for the 'granny lane'

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Re: 18" rear wheel

Post  Onthebrakes on Tue 14 Apr - 18:40

Hi
Didn't use the motorway in the end because of the 50 mph head winds but did the 50 mile trip using back roads sometimes only managing 25 mph flat out
I will do
O some mods to a spare engine I have with a view to increasing the output a little
Does anyone know the standard engine output.

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Re: 18" rear wheel

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