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-   -   2 questions (http://www.biker.ie/forum/showthread.php?t=244127)

jp biker 12th June 2018 06:20 PM

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

Interceptor 12th June 2018 06:31 PM

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

taillift 12th June 2018 06:43 PM

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!!

allsorts&oddjobs 12th June 2018 06:46 PM

Re: 2 questions
 
hes done loads of wheelies, bigger sprocket and abs disconnect are all for wheelies, walk away.

HIGHSIDER 12th June 2018 06:49 PM

Re: 2 questions
 
Walk away...

Gixxer 12th June 2018 06:51 PM

Re: 2 questions
 
Most bikes have a bigger back sprocket.

Interceptor 12th June 2018 07:27 PM

Re: 2 questions
 
[quote=Gixxer;3541382]Most bikes have a bigger back sprocket.[/quote]

Yeah but would you say he's compensating for something?

:ninja:

jp biker 12th June 2018 07:32 PM

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

me2 12th June 2018 07:42 PM

Re: 2 questions
 
look to the bright side, the front type won't have much wear on it. :bag:

batman_oh 12th June 2018 07:47 PM

Re: 2 questions
 
No ABS on that model R1. The wheel speed sensors are for the traction control

Jofass 12th June 2018 07:59 PM

Re: 2 questions
 
That model doesnít come with ABS... I think heís seen you comin

jp biker 12th June 2018 08:21 PM

Re: 2 questions
 
[quote=Jofass;3541398]That model doesnít come with ABS... I think heís seen you comin[/quote]

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 ?

Jofass 12th June 2018 08:26 PM

Re: 2 questions
 
Mine was a ‘14, the grey was where the blue is and vice versa on the one youre lookin at

jp biker 12th June 2018 08:30 PM

Re: 2 questions
 
[quote=Jofass;3541401]Mine was a Ď14, the grey was where the blue is and vice versa on the one youre lookin at[/quote]

Have you see the 13 ?
It was a ccs bike befour

Jofass 12th June 2018 09:51 PM

Re: 2 questions
 
Nice yoke ya, the akras n link pipe are 2500 euro

manbearpig 12th June 2018 10:09 PM

Re: 2 questions
 
[quote=Interceptor;3541376]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[/quote]

Would an increased rear sprocket (going up in no
of teeth) not mean increased top speed?

RubaDub 12th June 2018 10:12 PM

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

The comb over kid 12th June 2018 10:12 PM

Re: 2 questions
 
[quote=jp biker;3541403]Have you see the 13 ?
It was a ccs bike befour[/quote]

Something smells wrong here and i'm open minded but the shits all fooked up:lbhbh:

gsxr100k7 12th June 2018 10:20 PM

Re: 2 questions
 
[quote=manbearpig;3541426]Would an increased rear sprocket (going up in no
of teeth) not mean increased top speed?[/quote]

No faster acceleration and lower top speed..vise versa for the front..think of a mountain bike

pedrosixfour 12th June 2018 10:28 PM

[quote=manbearpig;3541426]Would an increased rear sprocket (going up in no
of teeth) not mean increased top speed?[/quote]

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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