Too optinisic speedo??

Go down

Too optinisic speedo?? Empty Too optinisic speedo??

Post  bat-kam on Tue May 12 2015, 15:30

Since I bought my Cat the speedo cable snapped at the wheel end. I don't know if it was ever changed or lubed so no problem I ordered a new one of ebay. Since putting the new cable on it looks like and feel that it is a bit optimistic. Doing 30 mph feels more like 25 and 40 more like 30. Has anyone experienced anything like this?
My last bike was GSXR 750 so I was sitting closer to the ground and bit more forward. maybe different bike gives different sensation of the speed.

Did the test with ride tracker on my iPhone going to work today and the tracker says that the distance covered is 5.2miles and the odometer 5.5miles. I checked on the google maps and that shows 5.2miles too.

Any advice would be appreciated.

Thanks

Kam
bat-kam
bat-kam
5Bronze
5Bronze

Male Status :
Online
Offline

Number of posts : 41
Registration date : 2015-05-11


Back to top Go down

Too optinisic speedo?? Empty Re: Too optinisic speedo??

Post  SteveCat on Tue May 12 2015, 16:14

It does over read, mind you at 30 it is supposed to be fairly accurate. The distance check you did does not surprise me. It isn't only the Thundercat, most speedos aren't right.

My new Tracer is also optimistic and that is all electronic, it claims I'm going faster than I actually am (compared to a SatNav) it also says I'm getting a better MPG than I am too.

Think you may be right about the riding position and speed sensation, I'm now riding upright and 50 feels like 30 Shocked
SteveCat
SteveCat
Admin2
Admin2

Male Status :
Online
Offline

Number of posts : 4994
Humour : You've gotta be joking
Registration date : 2008-11-06


Back to top Go down

Too optinisic speedo?? Empty Re: Too optinisic speedo??

Post  mikeyzf600 on Mon May 25 2015, 20:01

A way to tell is by going into 4th gear and using the revs. E.G. 6k revs in 4th gear is 60mph, 4k revs is 40mph etc. I believe this is fairly accurate.
mikeyzf600
mikeyzf600
6Silver
6Silver

Male Status :
Online
Offline

Number of posts : 378
Hobbies : Electrician
Humour : Sarcastic
Registration date : 2012-07-18


Back to top Go down

Too optinisic speedo?? Empty Re: Too optinisic speedo??

Post  bat-kam on Tue May 26 2015, 16:00

Mike - I did what you suggested this morning and it was reading 2-5mph over 40, 50 and so on.
My final test will be with a satnav and phone speed app.

after all it is better for the speedo to show higher speed. This way I won't receive any speeding fines Wink
bat-kam
bat-kam
5Bronze
5Bronze

Male Status :
Online
Offline

Number of posts : 41
Registration date : 2015-05-11


Back to top Go down

Too optinisic speedo?? Empty Re: Too optinisic speedo??

Post  Catnapper on Tue May 26 2015, 19:24

Just a thought. Have you got standard size tyres on?
Catnapper
Catnapper
6Silver
6Silver

Male Status :
Online
Offline

Number of posts : 364
Hobbies : Motoring, DIY
Humour : Lacking, Grumpy Old Man
Registration date : 2015-02-09


Back to top Go down

Too optinisic speedo?? Empty Re: Too optinisic speedo??

Post  bat-kam on Tue May 26 2015, 21:37

I didn't think of the tyres. It should be 120/60/17. I will check tomorrow moring, but what size would it have to be to boost the speed on the clock? I guess smaller in order to turn quicker. So if its 120/50/17 that would be it. Right?
bat-kam
bat-kam
5Bronze
5Bronze

Male Status :
Online
Offline

Number of posts : 41
Registration date : 2015-05-11


Back to top Go down

Too optinisic speedo?? Empty Re: Too optinisic speedo??

Post  Catnapper on Tue May 26 2015, 21:52

Right I'm not a maths genius or physicist BUT
if your running 120/70 instead of 120/60 (standard) your circumference will be greater (greater % of profile on width) vica versa with 50 profile tyres
What I'm not sure is which way this will change speedo reading.
I think some folks do run 70 profile so maybe they could compare, also some people may only run a 16" front wheel.
Not much help sorry but maybe a step in the right direction.
Irun 120/60 x 17 and next time out will test the 4th gear scenario and let you know
Catnapper
Catnapper
6Silver
6Silver

Male Status :
Online
Offline

Number of posts : 364
Hobbies : Motoring, DIY
Humour : Lacking, Grumpy Old Man
Registration date : 2015-02-09


Back to top Go down

Too optinisic speedo?? Empty Re: Too optinisic speedo??

Post  past-it on Wed May 27 2015, 00:14

2 to 5 mph over at those speeds is with in legal limits, and would be no different than almost all speedos on any vehicle. Very few speedos read true unless they have been set up, ie police speedos and tachographs.
avatar
past-it
5Silver
5Silver

Male Status :
Online
Offline

Number of posts : 336
Registration date : 2011-11-22


Back to top Go down

Too optinisic speedo?? Empty Re: Too optinisic speedo??

Post  Catnapper on Sat Jun 06 2015, 22:23

@Catnapper wrote:Right I'm not a maths genius or physicist BUT
if your running 120/70 instead of 120/60 (standard) your circumference will be greater (greater % of profile on width) vica versa with 50 profile tyres
What I'm not sure is which way this will change speedo reading.
I think some folks do run 70 profile so maybe they could compare, also some people may only run a 16" front wheel.
Not much help sorry but maybe a step in the right direction.
Irun 120/60 x 17 and next time out will test the 4th gear scenario and let you know

May speedo appears to be the same 2-5 mph over in 4th
Catnapper
Catnapper
6Silver
6Silver

Male Status :
Online
Offline

Number of posts : 364
Hobbies : Motoring, DIY
Humour : Lacking, Grumpy Old Man
Registration date : 2015-02-09


Back to top Go down

Too optinisic speedo?? Empty Re: Too optinisic speedo??

Post  bat-kam on Mon Jun 08 2015, 08:24

Thank you all for your comments. Because I have new set of tyres I will keep them on and ride knowing that I am under by 2-5mph to what speedo is showing.
Next set of tyres will be 170 size
bat-kam
bat-kam
5Bronze
5Bronze

Male Status :
Online
Offline

Number of posts : 41
Registration date : 2015-05-11


Back to top Go down

Back to top


 
Permissions in this forum:
You cannot reply to topics in this forum