 Wheel Balance, Front vs Rear |
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| jim_hoyland |
 Jun 1 2021, 02:21 PM
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#1
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Get that VIN ?  Group: Members Posts: 9,298 Joined: 1-May 03 From: Sunset Beach, CA Member No.: 643 Region Association: Southern California 
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After getting front wheel vibration at 65 mph. I switched the driver side front to the rear, moved rear to front. Vibration gone .
Question is whether rear wheel balance is critical ? |
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Replies(1 - 8)
| Superhawk996 |
Jun 1 2021, 04:21 PM
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#2
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914 Guru Group: Members Posts: 5,824 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch
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QUOTE(jim_hoyland @ Jun 1 2021, 04:21 PM)  After getting front wheel vibration at 65 mph. I switched the driver side front to the rear, moved rear to front. Vibration gone . Question is whether rear wheel balance is critical ? As you've noticed the rear is not as critical. Front suspension has more degrees of freedom than the rear. Rotational imbalance in the front can more easily set up an oscillation that you can feel. You feel it more readily in steering wheel by virtue of the direct connection to your hands. Your hands and fingertips are the most sensitive part of your body. Cross-car osciallation in the steering system is damped only by interal friction of the steering system. Rear suspension can still set up an oscillation in vertical direction. However, now you have dampers acting in that direction. Likewise your (IMG:style_emoticons/default/bootyshake.gif) -ometer isn't nearly as sensitive as your hands so you don't notice it as easily. You can still have rear wheel imbalance that is nasty but it will rarely be as noticeable as on the front. |
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| jim_hoyland |
Jun 1 2021, 06:51 PM
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#3
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Get that VIN ? Group: Members Posts: 9,298 Joined: 1-May 03 From: Sunset Beach, CA Member No.: 643 Region Association: Southern California
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Thanks for that ! (IMG:style_emoticons/default/smile.gif)
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| mark04usa |
Jun 1 2021, 07:48 PM
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#4
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'70 1.7 Tangerine Group: Members Posts: 351 Joined: 14-September 09 From: Austin TX Member No.: 10,805 Region Association: Southwest Region
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Still a good idea to have balanced wheels on rear...a bad out of balance can contribute to suspension wear.
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| jim_hoyland |
Jun 1 2021, 09:21 PM
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#5
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Get that VIN ? Group: Members Posts: 9,298 Joined: 1-May 03 From: Sunset Beach, CA Member No.: 643 Region Association: Southern California
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QUOTE(mark04usa @ Jun 1 2021, 06:48 PM) Still a good idea to have balanced wheels on rear...a bad out of balance can contribute to suspension wear. Good point. Will have both re- balanced…. |
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| ndfrigi |
Jun 1 2021, 10:50 PM
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#6
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Advanced Member Group: Members Posts: 2,928 Joined: 21-August 11 From: Orange County Member No.: 13,474 Region Association: Southern California
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QUOTE(jim_hoyland @ Jun 1 2021, 08:21 PM) QUOTE(mark04usa @ Jun 1 2021, 06:48 PM) Still a good idea to have balanced wheels on rear...a bad out of balance can contribute to suspension wear. Good point. Will have both re- balanced…. Jim, if the previous front wheels won’t balance well, probably one or both of that front wheels has bent. |
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| jim_hoyland |
Jun 2 2021, 03:50 AM
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#7
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Get that VIN ? Group: Members Posts: 9,298 Joined: 1-May 03 From: Sunset Beach, CA Member No.: 643 Region Association: Southern California
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QUOTE(ndfrigi @ Jun 1 2021, 09:50 PM) QUOTE(jim_hoyland @ Jun 1 2021, 08:21 PM) QUOTE(mark04usa @ Jun 1 2021, 06:48 PM) Still a good idea to have balanced wheels on rear...a bad out of balance can contribute to suspension wear. Good point. Will have both re- balanced…. Jim, if the previous front wheels won’t balance well, probably one or both of that front wheels has bent. Both fronts were recently balanced at Grand Prix in Costa Mess. I think one or more of the balancing weights came off. Some of the road repairs can be felt up through the steering wheel. |
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| Racer |
Jun 2 2021, 04:43 AM
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#8
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Senior Member Group: Members Posts: 787 Joined: 25-August 03 From: Northern Virginia Member No.: 1,073 Region Association: MidAtlantic Region |
What year is your car? Its more critical on the early (pre 1972(?) ) cars without the hub centering ring on the front to ensure the wheel is tightened evenly and is as centered as possible.
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| jim_hoyland |
Jun 2 2021, 05:56 AM
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#9
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Get that VIN ? Group: Members Posts: 9,298 Joined: 1-May 03 From: Sunset Beach, CA Member No.: 643 Region Association: Southern California
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QUOTE(Racer @ Jun 2 2021, 03:43 AM) What year is your car? Its more critical on the early (pre 1972(?) ) cars without the hub centering ring on the front to ensure the wheel is tightened evenly and is as centered as possible. The 914 is a ‘75; however, the front hubs are custom billets that Brad Roberts sold. Not sure whether they a provision for centering Attached image(s) 
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