??? for those with "big rig" wheels....
ok, so these new sumitomo st908 tires i am waiting for to come in are speed rated at a "sad" 65 mph. with this rating being for a commercially weighted trucks, will it be safe to take the truck at speeds higher than this? my thinking is that because i am running well below the weight rating of these tires, it should be safe to travel at higher speeds than indicated??????? can someone please enlighten me on this??????
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The tuff part is getting them balanced properly. Ive had mine up to 85-90 mph plus for extended periods of time no worries. The funny part around here if you get on 95 and dont do 75-80 youll get run over even in a big truck so the speed rating on the tire goes out the window when tractor tailers are on your rear doing 80+. You will be fine.
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did you have to do some kind of lug conversion kit to run "big rig" rims???
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Originally Posted by CSAKing
(Post 1715299)
did you have to do some kind of lug conversion kit to run "big rig" rims???
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I wondered about the speed rating also. I have 19.5" rims and tires on my truck and the tire is rated for 75 max. Bridgestone R250. I agree with the concern being balance more than the speed as 18 wheel trucks everywhere exceed the 65mph limit. Not all but alot of them.
Regarding the balance I used a balancer from centramatics that made my truck ride awesome with the 19.5 tire/rims. The tire/rims I have did have a shake after they were mounted and balanced statically that the centramatic balancer corrected. Balance master also makes a similar product but I have never used that brand. What have you done to balance the 22.5 tires? |
A combo of equal and spin balance. But I still have a little shimmy and shake at some speeds. I am also considering centeramics or something like it to throw into the mix.
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The one thing I did not like about the centramatics was how tight they fit on the front rims on my truck. I used Rickson 19.5" rims and there is not much room between rim and front caliper. The centramatics just barely touch the rim. if the centramatic had a little larger diameter they would have fit great. I am sure this is because centramatic designs there balancer for the truck. They have no idea as to what style/type rim a user may go with.
You may have better options because of the adapters you need for the 10 bolts. You can probably get a 10 bolt balancer and will not need to worry about caliper clearance. I was going to go with powder, beads or even anti-freeze in the tire but rather not have anything in there that may freeze in the Northeast weather. The anti-freeze I had read several users that swear by it. I thought it just sounded like the wrong thing to do. Good luck... |
Originally Posted by RyeThomas
(Post 1715382)
A combo of equal and spin balance. But I still have a little shimmy and shake at some speeds. I am also considering centeramics or something like it to throw into the mix.
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The truck is at home so I cant walk out and check but they are Sumitomos and I believe they are 255/70/R22.5 which equals about 37".
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Originally Posted by RyeThomas
(Post 1715414)
The truck is at home so I cant walk out and check but they are Sumitomos and I believe they are 255/70/R22.5 which equals about 37".
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No idea about the 5th wheel dont have one.
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Originally Posted by RyeThomas
(Post 1715445)
No idea about the 5th wheel dont have one.
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Originally Posted by ryfrat
(Post 1715567)
what size lift does it to get those tires to fit
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the ones i had didnt shake or vibrate at all. I used the sand weights on both my sets of tires and they worked perfect. The tire i ran both times were the DoubleCoin RLB900.
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Regarding the automatic balancers discussed above, I couldn't get the Centramatics to work on the front axle. They just wouldn't fit -- caliper interference. Centramatics on the back fit just fine. Ended up with a pair of balance masters on the front that work very well w/ my 265-70R19.5 Hankook DH01's (34.5" diameter).
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