so I'm basically stuck with what I've got.
another tire / wheel sizing question
Le Mans Master
Joined: Sep 2000
Posts: 6,101
Likes: 44
From: ABQ NM
Cruise-In II Veteran
thug29,
Just consider this; GM puts a 275 width tire on the 9.5" wide wheel, and a 295 tire on a 10.5" wheel....
275/35-19 is a straightforward plus one sizing from a 275/40-18, but you're going with a wider wheel now. How it looks aside, does the tire mfr. recommend this size on your width wheel? And even if it's within allowed parameters, if it's at one end of the range, I suspect it would not be considered ideal.
Just consider this; GM puts a 275 width tire on the 9.5" wide wheel, and a 295 tire on a 10.5" wheel....
275/35-19 is a straightforward plus one sizing from a 275/40-18, but you're going with a wider wheel now. How it looks aside, does the tire mfr. recommend this size on your width wheel? And even if it's within allowed parameters, if it's at one end of the range, I suspect it would not be considered ideal.
Pro
Joined: Dec 2004
Posts: 508
Likes: 0
From: boston ma
So what are you trying to say...stay with the 275/35/19 rear tires on my 19x10.5 wheel or am I able to bump it up to a larger size tire? Can I go 285, 295 ....? And for the height, stay at 35 or go down to 30 ???
Thank you very much.
Thank you very much.
Race Director
Joined: Jul 2005
Posts: 11,308
Likes: 1
From: The Beautiful Greater Bay Area California
Of course you would, FRANKAAAY! 
And, yes, for an o.e. based C5 rear wheel offset (a C5 with an C5 o.e. positive offset wheel design in mind), an ideal tire width size for an 10.5 inch wide rear wheel IS an 305mm tire. Moreover, as it is imperative that you properly match tire width sizes to appropriate ideal wheel widths, it is also important to consider the actual wheel offset of the specific wheel chosen for your application when selecting custom aftermarket wheels. Enjoy!
Le Mans Master
Joined: Nov 2001
Posts: 8,080
Likes: 151
From: Toronto
Words of wisdom AKA endensknight!
Of course you would, FRANKAAAY!
And, yes, for an o.e. based C5 rear wheel offset (a C5 with an C5 o.e. positive offset wheel design in mind), an ideal tire width size for an 10.5 inch wide rear wheel IS an 305mm tire. Moreover, as it is imperative that you properly match tire width sizes to appropriate ideal wheel widths, it is also important to consider the actual wheel offset of the specific wheel chosen for your application when selecting custom aftermarket wheels. Enjoy!
Of course you would, FRANKAAAY! And, yes, for an o.e. based C5 rear wheel offset (a C5 with an C5 o.e. positive offset wheel design in mind), an ideal tire width size for an 10.5 inch wide rear wheel IS an 305mm tire. Moreover, as it is imperative that you properly match tire width sizes to appropriate ideal wheel widths, it is also important to consider the actual wheel offset of the specific wheel chosen for your application when selecting custom aftermarket wheels. Enjoy!
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you can still send em back for a different brand in those sizes! 
