Changing wheel size
in [Car Maintenance]
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From: Paul on 29 Jan 2010 05:13 have a standard Megane diesel with the original 13" steel wheels fitted. have some 14" alloys, will fitting these have any negative effect on economy? what if I went up to 15"? cheers
From: Paul Giverin on 29 Jan 2010 05:36 In message <1-GdnUSEbLNHKf_WnZ2dnUVZ8vudnZ2d(a)brightview.com>, Paul <reply_through_group(a)first.ok> writes >have a standard Megane diesel with the original 13" steel wheels >fitted. > >have some 14" alloys, will fitting these have any negative effect >on economy? > >what if I went up to 15"? > >cheers > > If you lower the aspect ratio of the tyres then there will be minimal change to the rolling radius. If you don't change the aspect ratio then there will be negative effects of gearing and speedo reading. More info here:- http://www.carbibles.com/tyre_bible.html -- Paul Giverin My Photos:- www.pbase.com/vendee
From: Paul on 29 Jan 2010 07:24 Paul Giverin wrote in message news:qv6ekqCforYLFwgu(a)giverin.adsl24.co.uk... > In message <1-GdnUSEbLNHKf_WnZ2dnUVZ8vudnZ2d(a)brightview.com>, > Paul <reply_through_group(a)first.ok> writes >>have a standard Megane diesel with the original 13" steel >>wheels >>fitted. >>have some 14" alloys, will fitting these have any negative >>effect >>on economy? >> >>what if I went up to 15"? > If you lower the aspect ratio of the tyres then there will be > minimal change to the rolling radius. If you don't change the > aspect ratio then there will be negative effects of gearing and > speedo reading. > > More info here:- http://www.carbibles.com/tyre_bible.html Cheers Paul, particularly for the link.
From: Dave Plowman (News) on 29 Jan 2010 08:13 In article <1-GdnUSEbLNHKf_WnZ2dnUVZ8vudnZ2d(a)brightview.com>, Paul <reply_through_group(a)first.ok> wrote: > have a standard Megane diesel with the original 13" steel wheels > fitted. > have some 14" alloys, will fitting these have any negative effect > on economy? > what if I went up to 15"? If you fitted larger wheels and pro rata tyres you'd raise the gearing. Generally this results in better economy. But difficult to check because the odometer would now give an incorrect reading. -- *Happiness is seeing your mother-in-law on a milk carton Dave Plowman dave(a)davenoise.co.uk London SW To e-mail, change noise into sound.
From: Paul on 29 Jan 2010 11:16
Dave Plowman (News) wrote in message news:50e1387868dave(a)davenoise.co.uk... > In article <1-GdnUSEbLNHKf_WnZ2dnUVZ8vudnZ2d(a)brightview.com>, > Paul <reply_through_group(a)first.ok> wrote: >> have a standard Megane diesel with the original 13" steel >> wheels >> fitted. > >> have some 14" alloys, will fitting these have any negative >> effect >> on economy? > >> what if I went up to 15"? > > If you fitted larger wheels and pro rata tyres you'd raise the > gearing. > Generally this results in better economy. But difficult to > check because > the odometer would now give an incorrect reading. Thanks Dave, you set me thinking. The last time I changed some wheels on a car, I went from 13" to 15" and it was the first time since I had owned the car that the speedo reading tallied with my satnav, previously the car was always showing about 4mph faster. As my Megane speedo shows a similar difference, can I expect the same result? Thanks, |