Speed capability on different roads.

[SpannerMonkey]

This is going to sound wierd...
but why is it my bike (Suzuki GN250) is capable of 75-80 indicated on the flat on the motorway... only slowing to 70mph minimum on uphill gradients
but the minute I jump on the A442 (the bit going through the centre of telford) with a slight gradient, the bike isnt even capable of holding 60? and when I get on the flat on the A442 it will only do 65...
I know it's not mechanics related so I didnt post it in workshop but why is this?
It does it EVERY time and in the SAME places.

[MarkJ]

Tyres need pumping up and they roll a bit better on a smooth motorway?

[N cee thirty]

think i've been on that road through telford,my rs50 only like managed 30 D:
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'00 Aprilia RS50 > '92 Honda CG > '99 Yamaha Fazer > '91 Yamaha RXS > '79 Suzuki X5 > 01' Honda Cg > 07' Honda Cg > 82' Kawasaki Z200 > suzuki gsxr 400 gk73a > honda vfr 400 NC30 Mod 2 Passed 09/06/2011

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[Paulington]

Tailwinds?

Drafting other cars?

There may be a slight incline that is barely perceptible?

Are you always passing the same points in the same order? The bike may not be sufficiently warmed up on the A442 but by the time you get to the motorway it may be warmed?

So many possible answers. .
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"Four wheels move the body, two wheels move the soul."
Current Vehicles: '89 Kawasaki KDX200, '99 Yamaha XV535, '00 Honda ST1100 Pan-European, '08 Suzuki GSX-R1000, '08 Mitsubishi Lancer GS4 2.0 TDCi, '15 BMW 1 Series 116d Sport Turbo.
CBT: 27/08/08. Theory: 04/09/09. Module 1: 16/09/09. Module 2: 01/10/09.

[SpannerMonkey]

[SpannerMonkey]

[SpannerMonkey]

[iooi]

Could it be because the throttle is held fully open a lot longer on the M'way than on the A road....

As your tyre heats up it will expand. Thus your indicated speed should drop as the rolling radius increases.
But only by a very little bit
On a M'way. Your tyre temp could drop as its not working as hard, due to less breaking and cornering. Despite higher speeds
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Just because my bike was A DIVVY, does not mean i am......

[SpannerMonkey]

[EUMP]

It's like that on a 125, you need the best conditions for the best performance of speed, normally more open roads will be harder to gain the speed due to the wind resistance, some roads I can barely hold 60mph, others I can max out doing 80, others around 71.

To me it comes down to the road surface, weather condition, windage and positioning of the rider.
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C.B.T - Expired
MOD1 04/08/10
MOD2 10/08/10

[SpannerMonkey]

[Blau Zedong]

My orignal X5 would only ever hit the book speed of 85mph on the eastbound A63 just under the Humber bridge. Mind you it was pretty worn.
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[Acemastr]

Different road types have different rolling resistance, i used to find this on the A428 near me, going one way i could go faster than the other
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2017 KTM 350 XC-F - 2014 Yamaha R6 - 2005 Yamaha YZ125
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[SpannerMonkey]

[Teflon-Mike]

[SpannerMonkey]

[Teflon-Mike]

[SpannerMonkey]

[qarka]