Wheel size change = Altered speedo readings?

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mjb666
Posts: 618
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Location: Surrey. M3-Junction 4.

Wheel size change = Altered speedo readings?

Post: # 16543Post mjb666
January 11th, 2017, 2:52 pm

The previous owner of my Mitsubishi L200 4x2 Single cab changed the wheels from the original 14" pressed steel wheels

Imagescreen shot on pc

with 185R14 tyres

Imageimage sharing sites

to these snazzy looking alloys

Imageimage sharing sites

with 235/70R16 tyres

Imageimage ru

It seems to me that i'm driving faster than the displayed speed. Does anyone have a simple way of telling me how far out, if at all, i might be?

Thanks

Mike
2005 Mitsubishi L200 Single Cab 4x2
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zildjian
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Re: Wheel size change = Altered speedo readings?

Post: # 16544Post zildjian
January 11th, 2017, 4:20 pm

buy or borrow a road angel speed camera detector to display your speed

Mike
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Joined: August 23rd, 2014, 8:36 pm
Location: near Yeovil

Re: Wheel size change = Altered speedo readings?

Post: # 16546Post Mike
January 11th, 2017, 6:57 pm

Or if you have a smart phone there are a number of apps linked to the GPS built into the phone which will display speed.
Or a great free navigation app is HERE maps developed by Nokia originally you down load just the maps you need so no streaming charges. I use it a lot when I travel in Ireland in hire cars on business.It displays speed which is the point of this......
2008 Ford Ranger 3.0 Wildtrack
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zildjian
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Re: Wheel size change = Altered speedo readings?

Post: # 16548Post zildjian
January 11th, 2017, 7:19 pm

You only need use it for awhile, then add a note to identify where 30/60/70 actually are on your speedo
(or as tractors) work out from rev counter and gear you are in,
how fast you are travelling

earthman
Posts: 140
Joined: April 22nd, 2015, 2:26 pm

Re: Wheel size change = Altered speedo readings?

Post: # 16549Post earthman
January 11th, 2017, 7:58 pm

Another option maybe, find a place on the dash to mount a Scangauge or similar, apart from giving a speed readout there's other features, it can read/clear some fault codes too,.....all assuming that the vehicle has an OBD2 port in the first place.

https://www.scangauge.com/

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Toshbins
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Location: Between Reading and Oxford

Re: Wheel size change = Altered speedo readings?

Post: # 16551Post Toshbins
January 11th, 2017, 10:07 pm

Mathematically, the new tyres should be only about 1.3% bigger, but a GPS speedo on your phone should confirm it.

mjb666
Posts: 618
Joined: August 23rd, 2014, 5:07 pm
Location: Surrey. M3-Junction 4.

Re: Wheel size change = Altered speedo readings?

Post: # 16552Post mjb666
January 11th, 2017, 10:08 pm

Thanks for all the suggestions, i will checking to see if i actually have a OBD2 port?
2005 Mitsubishi L200 Single Cab 4x2
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Toshbins
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Re: Wheel size change = Altered speedo readings?

Post: # 16553Post Toshbins
January 11th, 2017, 10:32 pm

Whoops. That should read 10.3%.

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zildjian
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Re: Wheel size change = Altered speedo readings?

Post: # 16554Post zildjian
January 11th, 2017, 10:57 pm

Image


somewhere lowdown on dashboard maybe below steering wheel or glove box

earthman
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Re: Wheel size change = Altered speedo readings?

Post: # 16556Post earthman
January 12th, 2017, 12:41 am

mjb666 wrote:Thanks for all the suggestions, i will checking to see if i actually have a OBD2 port?
If it's a 2005 vehicle, it should have one. You may have to remove a piece of plastic/trim to see it first but it should be within reach of the drivers seat, I believe that were one of the rules.

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