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14" Rim to 15" Rim Help by Stainless1911
Started on: 08-17-2013 10:04 AM
Replies: 9 (184 views)
Last post by: NetCam on 08-18-2013 12:07 AM
Stainless1911
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Report this Post08-17-2013 10:04 AM Click Here to See the Profile for Stainless1911Click Here to Email Stainless1911Send a Private Message to Stainless1911Edit/Delete MessageReply w/QuoteDirect Link to This Post
I haven't been on in a while, the Fiero has been great to me since you helped me save her. Thanks.

I had 14" rims on the car, 185/75/14 to be more precise, and I ran into a good deal on a set of 15" alloy rims, so I bought them. Now I need tires, and don't want to mess up the speedo, which is accurate as it sits, tire sizes are correct at this time. The rims are wider than the old ones as well, I saw a 6.5 on the rim, I assume that's the width in inches?

So my question, what size tires do I need?

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I have a 1987 Fiero, 4 cylinder 5 speed. With an 88 engine.

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DimeMachine
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Report this Post08-17-2013 10:06 AM Click Here to See the Profile for DimeMachineSend a Private Message to DimeMachineEdit/Delete MessageReply w/QuoteDirect Link to This Post
Go to tirerack.com and look at the diameter of your current tire size and then look at various tire sizes with the 15" rim. there are specs for each tire - find one the the same diameter and your speedo will not be affected.

[This message has been edited by DimeMachine (edited 08-17-2013).]

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Stainless1911
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Report this Post08-17-2013 10:18 AM Click Here to See the Profile for Stainless1911Click Here to Email Stainless1911Send a Private Message to Stainless1911Edit/Delete MessageReply w/QuoteDirect Link to This Post
I measured the diameter, bald, it was about 24 3/4"

[This message has been edited by Stainless1911 (edited 08-17-2013).]

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Stainless1911
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Report this Post08-17-2013 10:20 AM Click Here to See the Profile for Stainless1911Click Here to Email Stainless1911Send a Private Message to Stainless1911Edit/Delete MessageReply w/QuoteDirect Link to This Post

Stainless1911

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Member since Apr 2012
I dont see where they want to enter the diameter. All it wants is a make/model/

Any other sources or charts?
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Stainless1911
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Report this Post08-17-2013 10:28 AM Click Here to See the Profile for Stainless1911Click Here to Email Stainless1911Send a Private Message to Stainless1911Edit/Delete MessageReply w/QuoteDirect Link to This Post
According to this:

http://tire-size-conversion...ire-size-comparison/

I need a 215/60/15
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IMSA GT
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Report this Post08-17-2013 12:33 PM Click Here to See the Profile for IMSA GTClick Here to Email IMSA GTSend a Private Message to IMSA GTEdit/Delete MessageReply w/QuoteDirect Link to This Post
205/60/15 which is 24.7"
http://www.tirerack.com/

Click on the link for tire size and you can search for your tires. Use the "spec" tab on each tire to see the info.

[This message has been edited by IMSA GT (edited 08-17-2013).]

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Lou6t4gto
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Report this Post08-17-2013 01:29 PM Click Here to See the Profile for Lou6t4gtoClick Here to Email Lou6t4gtoSend a Private Message to Lou6t4gtoEdit/Delete MessageReply w/QuoteDirect Link to This Post
205 or 215 60 will come up correct. Manufacturers may "Vary" a hair. because you went from 14" 75 to 15" 60 the height will be the same. because of the shorter sidewalls it will handle better
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fierosound
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Report this Post08-17-2013 01:50 PM Click Here to See the Profile for fierosoundClick Here to visit fierosound's HomePageClick Here to Email fierosoundSend a Private Message to fierosoundEdit/Delete MessageReply w/QuoteDirect Link to This Post
Tire sizes P185/80R13, P185/75R14, P195/70R14, P215/60R15 all used the same speedo gear.
Use GT sizing of P205/60R15 on the front and P215/60R15 on the REAR and you' re speedo will be be good.

See here: http://www.fiero.nl/forum/A...110502-2-093414.html

[This message has been edited by fierosound (edited 08-17-2013).]

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Stainless1911
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Report this Post08-17-2013 08:39 PM Click Here to See the Profile for Stainless1911Click Here to Email Stainless1911Send a Private Message to Stainless1911Edit/Delete MessageReply w/QuoteDirect Link to This Post
Awesome guys, I was hoping for better performance. The 14's were bald, like float on the water ohcrap kinda bad. I wasnt happy with them, and in my research found that anything but a single ply sidewall is a rarity. I decided to look for used 15" steel wheels to replace the steelies that were on it. The guy told me that he could get me alloy cheaper, so I bought the set for 200. I'll post a pic soon.
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NetCam
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Report this Post08-18-2013 12:07 AM Click Here to See the Profile for NetCamClick Here to visit NetCam's HomePageSend a Private Message to NetCamEdit/Delete MessageReply w/QuoteDirect Link to This Post
Basic rule of thumb is 10 on the ratio for each inch of rim size

14 = 75
15 = 65
16 = 55
17 = 45

Not precise, but pretty close
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