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Tyre Sizing Confusion
Posted: Tue Apr 20, 2010 8:59 pm
by fanx_ta_ra
Hi All,
Need to get four new tyres and am slightly confused about sizing. I have 17" alloys and at present they are fitted with 225/55/17's but when I was getting a quote today was told that the correct size should be 225/50/17
. Have searched the archives on here and it seems that both sizes are used but surely one must be a closer match to the original 215/65/15 with regards to the speedo reading / rolling circumference. Well thats it really and just gotta say while I'm on here that the knowledge and input on here from lots of you lads and lasses makes owning a Bongo so much easier and enjoyable so well done all of you
.
Cheers, Andy
Re: Tyre Sizing Confusion
Posted: Tue Apr 20, 2010 9:11 pm
by madmile
I am pretty sure mazda never had 17" option, so if you get near enough then I am sure you will be fine. I run on 215/55/17's and have never had a problem. I also use 245/24/18 on another bongo and these are definitely bigger than standard.
As long as your load rating is correct and you dont have different sizes on the 4wd (except for mazdas accepted combination) then you should be OK.
Re: Tyre Sizing Confusion
Posted: Tue Apr 20, 2010 9:14 pm
by westonwarrior
there is a converter in the link below put in your origonal size 195/70/15 and the new size and it compares rolling diameter etc
http://www.tyresave.co.uk/tyresize.html
225/50/17 are closer to the origonal spec than 55
Re: Tyre Sizing Confusion
Posted: Tue Apr 20, 2010 9:15 pm
by maxheadroom
Re: Tyre Sizing Confusion
Posted: Tue Apr 20, 2010 9:18 pm
by missfixit70
The 55 profile should be a slightly more comfortable ride, main thing as Madmile said is to makes sure Load & Speed Rating are a minimum of 96S. The speedo is usually fairly inaccurate anyway.
Re: Tyre Sizing Confusion
Posted: Wed Apr 21, 2010 1:56 pm
by francophile1947
Re: Tyre Sizing Confusion
Posted: Wed Apr 21, 2010 2:06 pm
by Scott
I was playing around with a tyre converter and it spilled this out, all of these tyres sizes are compatible
Code: Select all
Tyre Wheels Width Height Height Difference
165/85 R 15 15" 6.50" (165mm) 26.04" (661.50mm) +0.04" (+1.00mm)
175/80 R 15 15" 6.89" (175mm) 26.02" (661.00mm) +0.02" (+0.50mm)
185/75 R 15 15" 7.28" (185mm) 25.93" (658.50mm) -0.08" (-2.00mm)
200/70 R 15 15" 7.87" (200mm) 26.02" (661.00mm) +0.02" (+0.50mm)
215/65 R 15 15" 8.46" (215mm) 26.00" (660.50mm) +0.00" (+0.00mm)
230/60 R 15 15" 9.06" (230mm) 25.87" (657.00mm) -0.14" (-3.50mm)
235/60 R 15 15" 9.25" (235mm) 26.10" (663.00mm) +0.10" (+2.50mm)
255/55 R 15 15" 10.04" (255mm) 26.04" (661.50mm) +0.04" (+1.00mm)
280/50 R 15 15" 11.02" (280mm) 26.02" (661.00mm) +0.02" (+0.50mm)
310/45 R 15 15" 12.20" (310mm) 25.98" (660.00mm) -0.02" (-0.50mm)
160/80 R 16 16" 6.30" (160mm) 26.08" (662.40mm) +0.07" (+1.90mm)
170/75 R 16 16" 6.69" (170mm) 26.04" (661.40mm) +0.04" (+0.90mm)
180/70 R 16 16" 7.09" (180mm) 25.92" (658.40mm) -0.08" (-2.10mm)
195/65 R 16 16" 7.68" (195mm) 25.98" (659.90mm) -0.02" (-0.60mm)
210/60 R 16 16" 8.27" (210mm) 25.92" (658.40mm) -0.08" (-2.10mm)
230/55 R 16 16" 9.06" (230mm) 25.96" (659.40mm) -0.04" (-1.10mm)
255/50 R 16 16" 10.04" (255mm) 26.04" (661.40mm) +0.04" (+0.90mm)
280/45 R 16 16" 11.02" (280mm) 25.92" (658.40mm) -0.08" (-2.10mm)
285/45 R 16 16" 11.22" (285mm) 26.10" (662.90mm) +0.09" (+2.40mm)
315/40 R 16 16" 12.40" (315mm) 25.92" (658.40mm) -0.08" (-2.10mm)
320/40 R 16 16" 12.60" (320mm) 26.08" (662.40mm) +0.07" (+1.90mm)
165/70 R 17 17" 6.50" (165mm) 26.09" (662.80mm) +0.09" (+2.30mm)
175/65 R 17 17" 6.89" (175mm) 25.96" (659.30mm) -0.05" (-1.20mm)
190/60 R 17 17" 7.48" (190mm) 25.98" (659.80mm) -0.03" (-0.70mm)
205/55 R 17 17" 8.07" (205mm) 25.88" (657.30mm) -0.13" (-3.20mm)
210/55 R 17 17" 8.27" (210mm) 26.09" (662.80mm) +0.09" (+2.30mm)
225/50 R 17 17" 8.86" (225mm) 25.86" (656.80mm) -0.15" (-3.70mm)
230/50 R 17 17" 9.06" (230mm) 26.06" (661.80mm) +0.05" (+1.30mm)
250/45 R 17 17" 9.84" (250mm) 25.86" (656.80mm) -0.15" (-3.70mm)
255/45 R 17 17" 10.04" (255mm) 26.04" (661.30mm) +0.03" (+0.80mm)
285/40 R 17 17" 11.22" (285mm) 25.98" (659.80mm) -0.03" (-0.70mm)
290/40 R 17 17" 11.42" (290mm) 26.13" (663.80mm) +0.13" (+3.30mm)
325/35 R 17 17" 12.80" (325mm) 25.96" (659.30mm) -0.05" (-1.20mm)
170/60 R 18 18" 6.69" (170mm) 26.03" (661.20mm) +0.03" (+0.70mm)
185/55 R 18 18" 7.28" (185mm) 26.01" (660.70mm) +0.01" (+0.20mm)
200/50 R 18 18" 7.87" (200mm) 25.87" (657.20mm) -0.13" (-3.30mm)
205/50 R 18 18" 8.07" (205mm) 26.07" (662.20mm) +0.07" (+1.70mm)
225/45 R 18 18" 8.86" (225mm) 25.97" (659.70mm) -0.03" (-0.80mm)
230/45 R 18 18" 9.06" (230mm) 26.15" (664.20mm) +0.15" (+3.70mm)
250/40 R 18 18" 9.84" (250mm) 25.87" (657.20mm) -0.13" (-3.30mm)
255/40 R 18 18" 10.04" (255mm) 26.03" (661.20mm) +0.03" (+0.70mm)
285/35 R 18 18" 11.22" (285mm) 25.85" (656.70mm) -0.15" (-3.80mm)
290/35 R 18 18" 11.42" (290mm) 25.99" (660.20mm) -0.01" (-0.30mm)
295/35 R 18 18" 11.61" (295mm) 26.13" (663.70mm) +0.13" (+3.20mm)
160/55 R 19 19" 6.30" (160mm) 25.93" (658.60mm) -0.07" (-1.90mm)
165/55 R 19 19" 6.50" (165mm) 26.15" (664.10mm) +0.14" (+3.60mm)
175/50 R 19 19" 6.89" (175mm) 25.89" (657.60mm) -0.11" (-2.90mm)
180/50 R 19 19" 7.09" (180mm) 26.09" (662.60mm) +0.08" (+2.10mm)
195/45 R 19 19" 7.68" (195mm) 25.91" (658.10mm) -0.09" (-2.40mm)
200/45 R 19 19" 7.87" (200mm) 26.09" (662.60mm) +0.08" (+2.10mm)
220/40 R 19 19" 8.66" (220mm) 25.93" (658.60mm) -0.07" (-1.90mm)
225/40 R 19 19" 8.86" (225mm) 26.09" (662.60mm) +0.08" (+2.10mm)
250/35 R 19 19" 9.84" (250mm) 25.89" (657.60mm) -0.11" (-2.90mm)
255/35 R 19 19" 10.04" (255mm) 26.03" (661.10mm) +0.02" (+0.60mm)
295/30 R 19 19" 11.61" (295mm) 25.97" (659.60mm) -0.04" (-0.90mm)
300/30 R 19 19" 11.81" (300mm) 26.09" (662.60mm) +0.08" (+2.10mm)
170/45 R 20 20" 6.69" (170mm) 26.02" (661.00mm) +0.02" (+0.50mm)
190/40 R 20 20" 7.48" (190mm) 25.98" (660.00mm) -0.02" (-0.50mm)
195/40 R 20 20" 7.68" (195mm) 26.14" (664.00mm) +0.14" (+3.50mm)
215/35 R 20 20" 8.46" (215mm) 25.93" (658.50mm) -0.08" (-2.00mm)
220/35 R 20 20" 8.66" (220mm) 26.06" (662.00mm) +0.06" (+1.50mm)
250/30 R 20 20" 9.84" (250mm) 25.91" (658.00mm) -0.10" (-2.50mm)
255/30 R 20 20" 10.04" (255mm) 26.02" (661.00mm) +0.02" (+0.50mm)
260/30 R 20 20" 10.24" (260mm) 26.14" (664.00mm) +0.14" (+3.50mm)
300/25 R 20 20" 11.81" (300mm) 25.91" (658.00mm) -0.10" (-2.50mm)
305/25 R 20 20" 12.01" (305mm) 26.00" (660.50mm) +0.00" (+0.00mm)
310/25 R 20 20" 12.20" (310mm) 26.10" (663.00mm) +0.10" (+2.50mm)
Now hows that for a choice
P.S I dont think all these sizes are actually available off the shelf
Re: Tyre Sizing Confusion
Posted: Wed Apr 21, 2010 2:32 pm
by missfixit70
Just adjust the speedo if it is under reading, just a matter of popping the needle off
Re: Tyre Sizing Confusion
Posted: Wed Apr 21, 2010 2:39 pm
by francophile1947
Re: Tyre Sizing Confusion
Posted: Wed Apr 21, 2010 2:41 pm
by missfixit70
Or you're just a wuss
Re: Tyre Sizing Confusion
Posted: Wed Apr 21, 2010 2:41 pm
by francophile1947
Re: Tyre Sizing Confusion
Posted: Thu Apr 22, 2010 8:21 am
by fanx_ta_ra
Thanks everybody for their input ....... really helpful. Now all I have to do is is find a good tyre for a good price and what with Nankangs, Linglongs and Wanlis etc etc etc I reckon I might spend a couple of hours on here later, ignoring the kids (as only a man can do
) and trawl through the archives finding out what others use and rate. Thanks again.
Andy
