mpg with 15T front and 42T rear - 48mpg

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ReggieGasket
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mpg with 15T front and 42T rear - 48mpg

#1 Post by ReggieGasket » Fri May 07, 2010 7:42 am

I've changed my gearing from stock (16F 41R) to 15F 42R. I was abit worried I would loose some mpg on my motorway commute. First figures in - 48mpg. 5k in top has dropped from around 80 to 75 (I think). But is the speedo accurate now? I was getting about 50mpg before, so I'm happy :smt003

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#2 Post by anzacinexile » Fri May 07, 2010 8:09 am

Dont worry about the speedo - its not affected by gearing (pickup is of the back wheel).

Didn't notice any difference in MPG when I did mine. I know the motors spinning faster so should burn more but to counter that, its not working so hard at a given speed so burns less
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#3 Post by Falco9 » Fri May 07, 2010 8:14 am

And don't forget one of the best side effects of the lowered gearing

Wheelies :smt003 :smt003 :smt003

F9 :smt006
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#4 Post by ReggieGasket » Fri May 07, 2010 8:17 am

I'm too chicken to try wheelies yet!
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#5 Post by ReggieGasket » Fri May 07, 2010 8:22 am

Oh, and by the way, have changed to a 520 chain. That's what the racers use. Before you tell me it will snap, my brother had a Gixer thou with 150hp which used this type of chain. He got over 10k miles out of it. It'll get a real work out at Anglesea on sunday, so we'll see if it can take the Falco power...
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#6 Post by Aladinsaneuk » Fri May 07, 2010 8:42 am

with respect mate = this is a v twin lump with the kind of torque that makes in line fours scream.....

i think we have discussed this a lot in the past and i think the concensus was stick with standard size


Let's face it, you wouldn't go to a nurse to get good advice on a problem with a Falco - you'd choose an Engineer or a mechanic...

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#7 Post by ReggieGasket » Fri May 07, 2010 10:50 am

Let's see. Mille racers would use a 520. It won't snap (famous last words). It might stretch too quickly to be practical.
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#8 Post by dyzio » Fri May 07, 2010 12:02 pm

Slightly off topic but why do people put the 520 on the Falco? What's wrong with the 525?
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#9 Post by D-Rider » Fri May 07, 2010 12:06 pm

dyzio wrote:Slightly off topic but why do people put the 520 on the Falco? What's wrong with the 525?
I doubt that many do.
It's a bit lighter
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dyzio
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#10 Post by dyzio » Fri May 07, 2010 12:13 pm

D-Rider wrote: It's a bit lighter


Does that make a huge difference?
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#11 Post by Aladinsaneuk » Fri May 07, 2010 12:48 pm

imho for falcos - nope


Let's face it, you wouldn't go to a nurse to get good advice on a problem with a Falco - you'd choose an Engineer or a mechanic...

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#12 Post by dyzio » Fri May 07, 2010 12:55 pm

Is it even noticeable in road riding?
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#13 Post by D-Rider » Fri May 07, 2010 12:58 pm

Doubt it - though I've never tried one and am very unlikely to.
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#14 Post by ReggieGasket » Sat May 08, 2010 9:23 am

My understanding is there is a significant weight saving, but I don't know how much. I'll let you know how it goes, but I think it would be difficult to feel the difference when riding. A 520 chain is an option for the Mille on the B&C Express website, so it's clearly a reasonable option. I probably wouldn't have bothered unless my brother had a chain in his garage he didn't need any more.
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Re: mpg with 15T front and 42T rear - 48mpg

#15 Post by GRFalco » Thu Jun 03, 2010 11:02 am

ReggieGasket wrote:I've changed my gearing from stock (16F 41R) to 15F 42R. I was abit worried I would loose some mpg on my motorway commute. First figures in - 48mpg. 5k in top has dropped from around 80 to 75 (I think). But is the speedo accurate now? I was getting about 50mpg before, so I'm happy :smt003

Goes like stink.
I think this is the same combination that I've got.
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