Motorcycle Safety & Driveability: Storage mechanism for Two Wheelers - Tyre/s - Bikes, storage of personal belongings, tyre puncture

Question
Dear Pat

Storage mechanism for Two Wheelers  - Tyre/s - Bikes
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There are Two Wheelers, Three Wheelers and Four Wheelers running on the Road.


What i observe in Two Wheelers i.e Bikes is there is no storage mechanism
for keeping extra Tyre/s which can be useful to the Driver in case there
is a tyre puncture while travelling on the road.

In Two wheelers Scooters, the tyre has a smaller circle radius,the extra Tyre
in a Scooter is fixed behind the rear tyre seat.

In three Wheelers Auto rickshaws the extra tyre is kept near engine placement
i.e rear/back door

In four Wheelers viz cars, jeeps the extra tyre and fixing tools can be kept in the storage mechanism i.e rear door.


In four Wheelers heavy vehicles viz Buses, Trucks, Lorries etc the extra tyre can be kept down below fixed.  

Is there any way to Keep a Storage mechanism for Bikes two wheelers ?. What could be the design for the same
if it is to be achieved ? can we keep the tyre below the seat where the driver is seating ?


Note : Observed that the tyres for each of the two, three and four wheeler vehicles is a circle and has a Different Radius
and circumference.

Awaiting your Reply,

Thanks & Regards,
Prashant S Akerkar

Answer
From what I observe it is not often necessary enough to be practical.

Only the most hard-core off-road (Paris-Dakar) or endurance (Iron Butt) types carry a spare. The added weight and bulk offsets the benefit. A tire will still need to be mounted on the wheel (a process requiring tools, knowhow, and compressor!) Carrying a spare tire with a spare wheel is even more impractical: way too heavy and bulky for how often most riders will need one (never).

That said, the best design would be carried low, to the rear, on the opposite side of the exhaust pipe if possible -- mounted like a saddlebag, with perhaps a functional saddlebag (for storage of personal belongings, tools, etc.) on the opposite side to balance the weight.

I hope that helps.

Pat