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  #1  
Old 12th June 2018, 06:20 PM
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Default 2 questions

I'm looking at a new bike which is a 13 r1
The guy has a bigger rear sprocket on the back
What does this achieve ?
Quicker take off or more top end speed ?

2nd the bike is abs but he has the rear
Abs disconnect for some reason.
Any idea what this does or why would
He disconnect it ???

thanks
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  #2  
Old 12th June 2018, 06:31 PM
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Default Re: 2 questions

The guy selling the bike could answer both questions better than anyone on here...

Bigger back sprocket = faster acceleration but lower top speed.

ABS disconnected could be for lots of reasons, none of them sensible. With the rear disconnected then the whole system won't work - the ABS control unit can't compare wheel speeds to decide if the bike is skidding. Sometimes a bike uses ABS data for anti-wheelie control but I'm not an expert.

'cptr
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  #3  
Old 12th June 2018, 06:43 PM
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Default Re: 2 questions

Abs sensor disconnected would have me walking away tbh,
Itís not just for the abs,all the other systems such as launch control,traction control,anti wheelie,Slide control or whatever all depend on a reading from that sensor to work properly or work at all!!
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  #4  
Old 12th June 2018, 06:46 PM
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Biker.ie Member No. 9980 from west limerick
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Default Re: 2 questions

hes done loads of wheelies, bigger sprocket and abs disconnect are all for wheelies, walk away.
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  #5  
Old 12th June 2018, 06:49 PM
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Default Re: 2 questions

Walk away...
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  #6  
Old 12th June 2018, 06:51 PM
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Default Re: 2 questions

Most bikes have a bigger back sprocket.
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  #7  
Old 12th June 2018, 07:27 PM
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Default Re: 2 questions

Originally Posted by Gixxer
Most bikes have a bigger back sprocket.
Yeah but would you say he's compensating for something?

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  #8  
Old 12th June 2018, 07:32 PM
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Default Re: 2 questions

The mature owner of the bike said
It's a bit of a wild yoke all right
With the throttle a bit snatchy.
Bike has had a custom map.
I don't think he's into wheelies tbh
Due too his mature age.
No sign of wheelies on the fork seals
Though and bike is in very good condition
Bar the square rear tyre
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  #9  
Old 12th June 2018, 07:42 PM
me2 me2 is offline
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Default Re: 2 questions

look to the bright side, the front type won't have much wear on it.
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  #10  
Old 12th June 2018, 07:47 PM
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Default Re: 2 questions

No ABS on that model R1. The wheel speed sensors are for the traction control
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  #11  
Old 12th June 2018, 07:59 PM
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Biker.ie Member No. 12044 from Galway
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Default Re: 2 questions

That model doesnít come with ABS... I think heís seen you comin
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  #12  
Old 12th June 2018, 08:21 PM
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Default Re: 2 questions

Originally Posted by Jofass
That model doesnít come with ABS... I think heís seen you comin
Hmm well that's what he said too me
Unless I'm confused with traction control.
Jofass did u own a blue/gray 13 r1 ?
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  #13  
Old 12th June 2018, 08:26 PM
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Biker.ie Member No. 12044 from Galway
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Default Re: 2 questions

Mine was a ‘14, the grey was where the blue is and vice versa on the one youre lookin at
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  #14  
Old 12th June 2018, 08:30 PM
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Biker.ie Member No. 36294 from the big smoke
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Default Re: 2 questions

Originally Posted by Jofass
Mine was a Ď14, the grey was where the blue is and vice versa on the one youre lookin at
Have you see the 13 ?
It was a ccs bike befour
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  #15  
Old 12th June 2018, 09:51 PM
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Biker.ie Member No. 12044 from Galway
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Default Re: 2 questions

Nice yoke ya, the akras n link pipe are 2500 euro
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  #16  
Old 12th June 2018, 10:09 PM
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Default Re: 2 questions

Originally Posted by Interceptor
The guy selling the bike could answer both questions better than anyone on here...

Bigger back sprocket = faster acceleration but lower top speed.

ABS disconnected could be for lots of reasons, none of them sensible. With the rear disconnected then the whole system won't work - the ABS control unit can't compare wheel speeds to decide if the bike is skidding. Sometimes a bike uses ABS data for anti-wheelie control but I'm not an expert.

'cptr
Would an increased rear sprocket (going up in no
of teeth) not mean increased top speed?
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  #17  
Old 12th June 2018, 10:12 PM
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Default Re: 2 questions

If there is no abs on that model I'd say rear sensor is disconnected to allow for wheelies and burnouts or sliding the rear by spinning it up.

Track bikes also use shorter gearing and some lads don't like TC on track

Last edited by RubaDub; 12th June 2018 at 10:19 PM.
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  #18  
Old 12th June 2018, 10:12 PM
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Default Re: 2 questions

Originally Posted by jp biker
Have you see the 13 ?
It was a ccs bike befour
Something smells wrong here and i'm open minded but the shits all fooked up
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  #19  
Old 12th June 2018, 10:20 PM
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Default Re: 2 questions

Originally Posted by manbearpig
Would an increased rear sprocket (going up in no
of teeth) not mean increased top speed?
No faster acceleration and lower top speed..vise versa for the front..think of a mountain bike
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  #20  
Old 12th June 2018, 10:28 PM
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Default

Originally Posted by manbearpig
Would an increased rear sprocket (going up in no
of teeth) not mean increased top speed?
Nope.

Adding teeth to the rear sprocket effectively shortens the gearing. The bike accelerates quicker because the rear wheel is turning at a lower rate, for a given engine speed. Meaning the powertrain is doing less work.

Adding teeth to the front sprocket has the opposite effect. Less acceleration but, theoretically, a higher top speed.

If the powertrain is being asked to do too much work then aerodynamics could see you with a lower top speed.

Adding one tooth to the front would have a similar result (roughly) as taking three from the rear. It is usually done as a combination of the two.
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