Choosing Speedo Gears For different wheels - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars
Ford Forum Ford Forum

» Auto Insurance
» Featured Product
ยป Wheel & Tire Center

Go Back   Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars > The Garage - Tech Forums > Trans | Driveline
Register Home Forum Active Topics Photo Gallery Auto Loans Garage Mark Forums Read Auto EscrowInsurance

FordForums.com is the premier Ford Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools Display Modes
Old 07-09-2005, 18:07   #1 (permalink)
Registered User
 
89Falcon's Avatar
 
Join Date: Sep 2004
Location: New Zealand
Age: 26
Posts: 48
confused Choosing Speedo Gears For different wheels

Hi guys

I have searched the forums but came up empty handed

anyway....

Im thinking of getting some mags but dont want to have my speedo out
The Car is an

89 EA Falcon
5 speed
2.77:1 Diff ratio (original auto ratio)
currently sitting on Factory 15"x7" mags with 205/65/15's
i think it has a red/pink speedo gear dunno its been a while since
i converted it to manual and saw the gear

and i plan to put on 14"x7" 12 slots with either 235's or 225's and they probably be a 65 series sidewall

what colour speedo gear do ya reckon would bring the speedo within a few percent?
__________________
Previous Rides:
1989 EA Falcon GL 4.0 LPG 5spd (ex 3spd auto)
1990 EA Fairmont Ghia 3.9 MPI 4spd Auto
1989 EA Falcon S 3.9 MPI 5spd

Current Rides
1989 EA Falcon S 3.9 MPI 5 spd
1990 EA Fairmont Ghia 3.9 MPI No Speed (soon to be manual)

And Still not sick of them yet
Havnt Blown a head gasket yet either
89Falcon is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 07-09-2005, 19:27   #2 (permalink)
Munch Munch Rice 4 Lunch
 
Join Date: Jul 2003
Location: Brisbane, Australia
Age: 31
Posts: 594
Re: Choosing Speedo Gears For different wheels

compare the roll-out diameter of each of the tyre sizes and if they are the same then you won't need to change speedo gears
__________________
"Buy a holden and be a morjority or buy a ford and be quick"
RevHeadRon is offline   Reply With Quote
Old 07-09-2005, 19:51   #3 (permalink)
Registered User
 
89Falcon's Avatar
 
Join Date: Sep 2004
Location: New Zealand
Age: 26
Posts: 48
Re: Choosing Speedo Gears For different wheels

good point
but the roll out diameter will be different
because the tires are both 65 series
eg
original= 205-65-15
new= 225-65-14

so the diameter of the new tyre will be more or less 1" difference due to the change of wheel diameter
__________________
Previous Rides:
1989 EA Falcon GL 4.0 LPG 5spd (ex 3spd auto)
1990 EA Fairmont Ghia 3.9 MPI 4spd Auto
1989 EA Falcon S 3.9 MPI 5spd

Current Rides
1989 EA Falcon S 3.9 MPI 5 spd
1990 EA Fairmont Ghia 3.9 MPI No Speed (soon to be manual)

And Still not sick of them yet
Havnt Blown a head gasket yet either
89Falcon is offline   Reply With Quote
Old 07-10-2005, 01:36   #4 (permalink)
Registered User
 
Join Date: Mar 2005
Posts: 475
Re: Choosing Speedo Gears For different wheels

Quote:
Originally Posted by 89Falcon
Hi guys
i plan to put on 14"x7" 12 slots with either 235's or 225's and they probably be a 65 series sidewall
Have you checked tyre availabilty yet? 235 and 225 are usually in a 60 series.

Also, not only is the tyre height changing, but also you are loosing an inch in rim diameter don't forget.

So, my last EA had 235/60s on 14x8, instead of the 15s, and it was nearly spot on. My current car will soon get 225/60 and 235/60 as well, and I am not in the least concerned about speedo error.

235/60 sit a lot better on 8s than 7s, unless you already have your rims.
RPO-083 is offline   Reply With Quote
Old 07-26-2005, 07:33   #5 (permalink)
Registered User
 
jas24zzk's Avatar
 
Join Date: Jul 2005
Location: Wandin, Vic
Age: 41
Posts: 827
Re: Choosing Speedo Gears For different wheels

Quote:
Originally Posted by 89Falcon
Hi guys
i think it has a red/pink speedo gear dunno its been a while since
i converted it to manual and saw the gear

and i plan to put on 14"x7" 12 slots with either 235's or 225's and they probably be a 65 series sidewall

what colour speedo gear do ya reckon would bring the speedo within a few percent?
G'day,
this is a very easy thing to overcome. Jack it up, pull out the speedo sender, and take a look in the box to get the colour.

Take ALL your specs to ya ford parts dealer and they will hand you the right gear.
Have done it countless times!

Cheers
Jas
jas24zzk is offline   Reply With Quote
Sponsored Links
Advertisement
 
Reply

  Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars > The Garage - Tech Forums > Trans | Driveline



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Powered by vBadvanced CMPS v3.2.2

All times are GMT -7. The time now is 07:12.



Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Relevant URLs by vBSEO 3.6.0
Garage Plus vBulletin Plugins by Drive Thru Online, Inc.