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Okan



Member Since: 17 Oct 2016
Location: Geneva
Posts: 138
Switzerland 2009 Defender 110 Puma 2.4 SW Stornoway Grey
16x8 or 16x10 modular?
Hi Guys!

I'm now running 255 BFG MT on 16x7 modular and I would like to put larger tires but staying in 33". I used a tire size calculator and I saw the perfect size is 33x12.5R15 but I prefer to have two set of 16inch rims and I don't understand whyy american size are only available for 15 inch rims. The metric conversion for 33x12.5R15 looks like between 305 70R16 and 315 70R16 but the 315 is a bit higher than 33 and this size is hard to find in Switzerland. In the two cases I'm not sure if 305 or 315 will fit on 16x8 or if I need 16x10 rims?

Some of you do have pics of those setup please?

Best regards
Post #612885 28th Mar 2017 5:17pm
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Arierep



Member Since: 12 Apr 2013
Location: Portugal
Posts: 258
Portugal 1995 Defender 90 300 Tdi SW Alpine White
Not a specialist but:
- American sizes (flotation sizes) use 15" to have more rubber and more bulge. That's a pro and a con, depending on circumstances.
- metric sizes generally have a more hd construction, also meaning a stiffer ride.
- 305/70r16 is the closest metric size to 33x12.5r15
- 12.5 or 315 tyres go well on 8" wheels
- 255/85r16 tend to be oversized 33s, closer to 33,5 (could be sold as 34s), while most 33x12.5r15 are quite undersized, closer to 32. You'll lose some height
- for a given tyre size, a narrow rim will give you better tyre retention at low pressures, a wider rim better flotation


Hope this helps
Post #627338 28th May 2017 12:01pm
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