Omega Owners Forum
Omega Help Area => Omega General Help => Topic started by: dpanic88 on 22 December 2008, 19:55:07
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:-? - just a general question, might be easy answer. Have 16" alloy on 2001 2.2dth estate - two have bent rims, looking at 17" Elite wheels to replace. Do you have to do any thing suspension wise or can you just swap them over - just different tyres.
many xmas regards -
dpanic88
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......, looking at 17" Elite wheels to replace. Do you have to do any thing suspension wise or can you just swap them over - just different tyres. .......
Not worth the hassle ..... loads of things to change over. ;)
I'll buy your 17" Elites off though you to save you the hassle of getting rid of 'em! ;) ;) :y :y :y
No! Just bolt them on! I don't see any reason for changing the size of the rubber already fitted to the 17"'s :y
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ok thanks
not purchased the 17" yet.. just looking as tyres on three of mine are almost out as well as the bent rims. so I thought why not and go for it.
ta
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Bolt straight on and solve all your problems. I've seen full sets with 4 good tyres on them for less than the price of 4 new tyres.
Go for it; you know you want to. Replacement tyres won't be much more, if anything, either when it comes round.
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avons are about 74 pounds a piece on camskill ;)
thats the zz3's or about 80 for the zv5's
and those are 235/45/17
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Will the speedo not be affected having a larger tyre. Think I read that somewhere since the tyre is larger and hence takes a longer time to do a full rotation compared with a 16" one. Ok its only an inch but it makes the difference speedo wise.
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:-? - just a general question, might be easy answer. Have 16" alloy on 2001 2.2dth estate - two have bent rims, looking at 17" Elite wheels to replace. Do you have to do any thing suspension wise or can you just swap them over - just different tyres.
many xmas regards -
dpanic88
Nice to see another poster local to me too :y
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Will the speedo not be affected having a larger tyre. Think I read that somewhere since the tyre is larger and hence takes a longer time to do a full rotation compared with a 16" one. Ok its only an inch but it makes the difference speedo wise.
You're changing from 16" to a 17" wheel & lets say you didn't change the profile of the rubber. The extra inch diameter would put your speedo out by minus 7%. So at 100 mph you would be doing 107 mph. So at a lower speed say 10 mph it's only 0.7 mph more & so on :y
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Will the speedo not be affected having a larger tyre. Think I read that somewhere since the tyre is larger and hence takes a longer time to do a full rotation compared with a 16" one. Ok its only an inch but it makes the difference speedo wise.
If you look here (http://homepage.ntlworld.com/andrew.reynolds983/Manuals/Omega2002Manual.pdf) on page 226 you'll see that as the trye rim diameter then the profile comes down ie a 15" has a 65% profile & a 17" has a 45% profile so that the rolling radius of both sizes of tyre and rim is near enough the same, so your speedo is still happy. :y
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hi many thanks for the info, purchased 4 - should be here next week.
just now need to get rid of two of the 5 alloys - two duff , bent and leaking air, one will keep for spare, two leff i'll post a any note in the for sale - 2 x 16" Free to a good home :D :D
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17s will rub the arches if the wishbones are nackered!
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will do - have replaced the front two recently (only done about 7k on these current ones).
But thanks for the heads up - will keep fingers crossed :)
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There is a setting for wheel sizes on instrument panel and MID/GID/CID, with 195/65/15,235/45/17 on one setting, and 225/55/16 on another.
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There is a setting for wheel sizes on instrument panel and MID/GID/CID, with 195/65/15,235/45/17 on one setting, and 225/55/16 on another.
But ...... how will your car know? If the running diameter is the same-ish, and the speedo is the same-ish, then surely what the MID thinks is on the car is irrelevent????? :-/ :-/ :-/ :y
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Will the speedo not be affected having a larger tyre. Think I read that somewhere since the tyre is larger and hence takes a longer time to do a full rotation compared with a 16" one. Ok its only an inch but it makes the difference speedo wise.
If you look here (http://homepage.ntlworld.com/andrew.reynolds983/Manuals/Omega2002Manual.pdf) on page 226 you'll see that as the trye rim diameter then the profile comes down ie a 15" has a 65% profile & a 17" has a 45% profile so that the rolling radius of both sizes of tyre and rim is near enough the same, so your speedo is still happy. :y
the percentage ratio is a percentage ratio of the total width of the tyre though... i had an interesting time working out what tyre ratios the tyres should be on different size wheels and different width tyres...fun being the operative word :P
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the percentage ratio is a percentage ratio of the total width of the tyre though...
I know! :y
i had an interesting time working out what tyre ratios the tyres should be on different size wheels and different width tyres...fun being the operative word :P
Why? :-/ there's plenty of sites - quoted here many times - that'll do the sums for you. :y :y :y
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There is a setting for wheel sizes on instrument panel and MID/GID/CID, with 195/65/15,235/45/17 on one setting, and 225/55/16 on another.
But ...... how will your car know? If the running diameter is the same-ish, and the speedo is the same-ish, then surely what the MID thinks is on the car is irrelevent????? :-/ :-/ :-/ :y
I can only assume that as GM have programmed these differently, they think there is a difference
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the percentage ratio is a percentage ratio of the total width of the tyre though...
I know! :y
i had an interesting time working out what tyre ratios the tyres should be on different size wheels and different width tyres...fun being the operative word :P
Why? :-/ there's plenty of sites - quoted here many times - that'll do the sums for you. :y :y :y
sorry andy.. i thought i'd be a geek and work it out on a piece of paper :P