Rims/Tires Question
- Thread starter Tyus
- Start date
Its weird. I think its a 10 bolt chevy but when i measure center to center on the lugs i get 4 and 1/2"
This one is saying to measure from lug to lug... which will give me 4 and 1/2" while the graph below shows that if its lug to lug is 4 and 1/2 ..that the bolt pattern would be 4.75 because its = C
Any Thoughts???
This might help with the bolt circle measurements.
GAB
Member
Lets see if I can explain this without getting too involved in high school geometry. When specifying bolt circle patterns for automotive wheels, we are talking about an imaginary circular line that has a diameter of X number of inches. The centers of the studs (or threaded hole) fall on that circular line. If we are trying to determine the diameter of a bolt circle for a 4 bolt circle wheel (or a 6 hole model) we can measure two opposite studs or holes as these are 180° apart and the centers fall on the imaginary circle. When dealing with 5 bolt patterns, that method doesn't work as no two studs are 180° apart. The closest that they come is 144°. That is the reason for the "B" dimension. By measuring the distance between those two points, we can predict what the "C" dimension will be from the chart. I probably should have made the "C" column the first one on the chart. The + and - mean just slightly more or less than the fractional distance.
I'm sure that this is about as clear as mud if you were guilty of reading hot rod books during geometry class.
I'm sure that this is about as clear as mud if you were guilty of reading hot rod books during geometry class.
Corley
New Member
Tyus4,
The mrt-wheel chart is not measuring from the center of both studs. Take a look, one is from the outer edge of a stud, the other from the middle of a stud. It is only an aproximation anyway, since stud sizes vary, and not very accurate. Use GABs chart, it is correct.
Corley
The mrt-wheel chart is not measuring from the center of both studs. Take a look, one is from the outer edge of a stud, the other from the middle of a stud. It is only an aproximation anyway, since stud sizes vary, and not very accurate. Use GABs chart, it is correct.
Corley
spike
New Member
Here is another simple way using any hole on the pattern & the center hole.
View attachment IMG.pdf
View attachment IMG.pdf
Good eye...I didn't even notice that. Thanks!!
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