| Author | Message | ||
| Phil Hendrix (Phil9tx)
Registered Member Username: Phil9tx Post Number: 13 Registered: 8-2006 Posted From: 207.155.58.249 Rating: N/A |
I need new trailing axle tires. Bought all new 315/80-22.5s awhile ago but just moved the best two to the tag and now they need replaced. Can I go to a narrower cheaper tire? Sam's even carries them. Thanks | ||
| David Dulmage (Daved)
Registered Member Username: Daved Post Number: 167 Registered: 12-2003 Posted From: 142.46.199.30 Rating: N/A |
Any tire you put on the tag axle should have the same load rating as what was originally designed for that axle. I would think that having exactly the same width and diameter may not be as important, as long as the tires and wheels are compatible. FWIW Dave Dulmage (Message edited by DaveD on June 27, 2007) | ||
| John MC9 (John_mc9)
Registered Member Username: John_mc9 Post Number: 412 Registered: 7-2006 Posted From: 68.205.165.5 Rating: N/A |
Commercial operators usually put used tires on the tags. My bus came with 315/80s on all, except the tags... Tires are generally moved from the steers to the drives, then to the tags/bogies, as they wear down.. Uhh... You do realize that these tires are designed to be re-grooved, right? Re-grooving is the cutting of new threads into the bald casing. Unless you're a glutton for empty bank accounts, why toss cash into what's going to wear out every time you make a turn? New tires on a tag or bogey, is like using top-shelf Scotch in the windshield washer. (just an opinion, ya'see....) | ||
| Sean Welsh (Sean)
Registered Member Username: Sean Post Number: 566 Registered: 1-2003 Posted From: 67.142.130.47 Rating: N/A |
To answer your original question: 12R22.5 is a size that will fit your existing wheels and will run about the same diameter and revs/mile as the 315/80R22.5 you are taking off. The 12R22.5 size is quite a bit more common, and also quite a bit cheaper than the 315/80. HOWEVER -- the reason 315/80 are normally specified is because they are available in higher load capacity than 12R22.5. So, before you make the change, you had better know for sure how much weight is riding on whatever axle you are talking about (I know you said trailing axle, but this also applies to drive and steer axles). Also, you may need to run higher air pressure in the 12R22.5 tires than you did in the 315/80R22.5's for the same load -- check the tire manufacturers' load and inflation tables. I would not try to change to anything other than the 12R22.5 -- IF your wheels are 8.25" (as opposed to 9", which is more commonly specified for 315/80R22.5), then an 11R22.5 tire will fit on the rim. However, its load capacity will be significantly lower, plus the tire diameter is smaller, which may have the effect of transferring more load to your drive axle, or causing other handling issues. If you have 9" rims, most 11R tires are not approved. Lastly, never mix sizes on the same axle, especially the drive axle. HTH. -Sean http://OurOdyssey.BlogSpot.com | ||
| R.C.Bishop (Chuckllb)
Registered Member Username: Chuckllb Post Number: 161 Registered: 7-2006 Posted From: 4.240.213.85 Rating: N/A |
JTNG.......  RCB |