H&R 20mm spacers installed
07-07-11, 07:25 PM
#17
If you aren't putting out a lot of torque then the long studs are probably alright for you, but good2go makes a very valid statement about the overlooked danger of large slip-on spacers (even if they are hubcentric). As he stated, while the hubcentric spacer supports the wheel and removes direct shear stress that would be otherwise imparted upon the studs by forces perpendicular to the axis of rotation, it does not prevent any bending stress that results from torque transmitted through the hub itself. Standard size studs with no spacer will still experience bending stress do to the torque, but since bending stress is proportional to moment arm (in this case the distance from the hub surface to the next supported location along the length of the stud which is the base of the lug nut), the longer studs will have a much higher bending stress because the next supported end of the stud is still the base of the lug nut which is now much further away. With 20mm more moment arm you are looking a lot higher bending stress on each stud. I'm not sure what the distance from the hub to the base of the lug nut typically is with no spacer so how much greater I can't be sure of. If somebody had a wheel handy they could measure the thickness of the wheel hub where the hole for a stud is to give a rough idea of the moment arm (the lug nuts have tapered ends which would reduce the moment arm a small amount for the measured thickness). The stress increase is certainly very significant, and it would be a good thing for people putting down substantial torque figures to note that this is a very real danger to them.
. Those are some big tires. That's definitely Supra fitment right there.
07-13-11, 10:24 AM
#25
Ha ha ha, these guys are way too smart these days!! I'm going to need to see an engineering degree with people's replies these days.
I'm rocking 20mm spacers with extended studs ,they havent gave me any problems for years!!!!
They hating to make themselves look better. I'm surprised accountx2 havent showed his ugly face here yet ,lol
I'm rocking 20mm spacers with extended studs ,they havent gave me any problems for years!!!!
They hating to make themselves look better. I'm surprised accountx2 havent showed his ugly face here yet ,lol
07-13-11, 10:38 AM
#26
If you aren't putting out a lot of torque then the long studs are probably alright for you, but good2go makes a very valid statement about the overlooked danger of large slip-on spacers (even if they are hubcentric). As he stated, while the hubcentric spacer supports the wheel and removes direct shear stress that would be otherwise imparted upon the studs by forces perpendicular to the axis of rotation, it does not prevent any bending stress that results from torque transmitted through the hub itself. Standard size studs with no spacer will still experience bending stress do to the torque, but since bending stress is proportional to moment arm (in this case the distance from the hub surface to the next supported location along the length of the stud which is the base of the lug nut), the longer studs will have a much higher bending stress because the next supported end of the stud is still the base of the lug nut which is now much further away. With 20mm more moment arm you are looking a lot higher bending stress on each stud. I'm not sure what the distance from the hub to the base of the lug nut typically is with no spacer so how much greater I can't be sure of. If somebody had a wheel handy they could measure the thickness of the wheel hub where the hole for a stud is to give a rough idea of the moment arm (the lug nuts have tapered ends which would reduce the moment arm a small amount for the measured thickness). The stress increase is certainly very significant, and it would be a good thing for people putting down substantial torque figures to note that this is a very real danger to them.
I'm sure after high HP we would see this problem, but who knows how much power it takes to do the damage.
Last edited by LEX_MAN; 07-13-11 at 10:46 AM.
07-13-11, 08:08 PM
#27
If the wheels were loose then that point would have been valid. But the lug nuts are torqued to 90foot lb's so theres no play between hub/spacer/wheel.The studs and nuts are compressing the wheel to the spacer to the hub, therefore theres no rotational movement. Wana see my engineering degree? Like you i dont have one, so my point is as useless as your guy's point.
I'm sure after high HP we would see this problem, but who knows how much power it takes to do the damage.
I'm sure after high HP we would see this problem, but who knows how much power it takes to do the damage.
EDIT: Why is it that when people post concerns about possible danger in certain situations it is construed as hate. Hate would be telling you that a noose makes a great Hans device and that you should install one. Ignorance is the new standard I guess.
Last edited by BartleDoo; 07-13-11 at 08:13 PM.
07-14-11, 10:04 PM
#28
Ok mister engineer, then tell me even if you make 1000 HP does it matter? No it doesnt , because theres this thing called wheel spin, and if you have certain amount of power going to the wheels ,everything over that amount will just spinn the tires and wont affect the stress on the lugs because the wheels going to break traction and spin freely.
So the power/torque doesnt matter, until you get better traction ....mr almost engineer :P
So the power/torque doesnt matter, until you get better traction ....mr almost engineer :P
07-15-11, 05:42 AM
#29
Ok mister engineer, then tell me even if you make 1000 HP does it matter? No it doesnt , because theres this thing called wheel spin, and if you have certain amount of power going to the wheels ,everything over that amount will just spinn the tires and wont affect the stress on the lugs because the wheels going to break traction and spin freely.
So the power/torque doesnt matter, until you get better traction ....mr almost engineer :P
So the power/torque doesnt matter, until you get better traction ....mr almost engineer :P