If no one else mentioned it, here is an easy way to get a little more clearance for the tire.� The limiting factor is the frame rails that the tire fits up between. Lots of people manage to�fit the BFG AT KO 215/75-15 tire which is 27.7" diameter.
http://www.van-cafe.com/home/van/page_348_129/oversized_spare_tire_carrier.html
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If you don't like the vancafe carrier it is possible to modify the stock clamshell to drop it down below the frame rail that the tire then rests on.� Kind of a hassle though if you don't need protection on the tire for offroading.
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I have a 225/70-14 that is around 26.5" diameter and it fit into the 87 clamshell no problem after removing the retaining bars.
Dave

On 8/11/2012 9:10 AM, Harry Hoffman wrote:
>
> Hi All,
> So I'm planning a move to 17" wheels. I'd like to carry a full spare.