SIM37 3rd Gear May 11, 2012 Share May 11, 2012 As per topic, wanna reduce width of tyre. Does anyone know if its possible? I've calculated the OD, slightly larger, so ok, but the rim width on 185, is it safe to do so? ↡ Advertisement Link to post Share on other sites More sharing options...
SimonTan 2nd Gear May 13, 2012 Share May 13, 2012 May make the tyre look like a skinny one. Link to post Share on other sites More sharing options...
Ckchong8 1st Gear May 14, 2012 Share May 14, 2012 As per topic, wanna reduce width of tyre. Does anyone know if its possible? I've calculated the OD, slightly larger, so ok, but the rim width on 185, is it safe to do so? Probably save fc but compromising on your ride firmness. Mine the other way round thinking of changing from 195/65/R15 to 205/55/R15 to conpensate my ride stability. Link to post Share on other sites More sharing options...
Roberttan 5th Gear May 14, 2012 Share May 14, 2012 As per topic, wanna reduce width of tyre. Does anyone know if its possible? I've calculated the OD, slightly larger, so ok, but the rim width on 185, is it safe to do so? can share what car are you driving? so easier for us to advise. droping(downsize) the size from original (factory spec ) is generally not recommended (could lead to some insurance issue legally) Link to post Share on other sites More sharing options...
SIM37 3rd Gear May 15, 2012 Author Share May 15, 2012 (edited) can share what car are you driving? so easier for us to advise. droping(downsize) the size from original (factory spec ) is generally not recommended (could lead to some insurance issue legally) swift 1.5 Was running 185/60/R15 on stock 5.5s but got new rims now. I calculated the OD, it'll be fine, but the only issue now is the new rims that are 6.5 instead of 5.5. Edited May 15, 2012 by SIM37 Link to post Share on other sites More sharing options...
Roberttan 5th Gear May 17, 2012 Share May 17, 2012 (edited) swift 1.5 Was running 185/60/R15 on stock 5.5s but got new rims now. I calculated the OD, it'll be fine, but the only issue now is the new rims that are 6.5 instead of 5.5. 5.5 and 6.5 width can take 185 / 195 tyre width better 5.5 with 185 and 6.5 with 195 . swift original 185/60/15 with 5.5 rim width if you are on 6.5 rim can put 195/55/15 for better handling if run 195/60/15 i think you will find it sluggish just MHO Edited May 17, 2012 by Roberttan Link to post Share on other sites More sharing options...
SIM37 3rd Gear May 18, 2012 Author Share May 18, 2012 5.5 and 6.5 width can take 185 / 195 tyre width better 5.5 with 185 and 6.5 with 195 . swift original 185/60/15 with 5.5 rim width if you are on 6.5 rim can put 195/55/15 for better handling if run 195/60/15 i think you will find it sluggish just MHO Don't mind it being sluggish as the speedo was registering over 7% faster than Actual GPS speed. At 5th gear, 100km/h, the little fella screaming at 3krpm. I put 195/60 to make it "longer" ratio. Speed match almost zhun zhun already. Not particular about handling, more targetting fuel economy and cruising as I drive to KL 2-3 times a month. Now wondering if its ok to run 185/65/R15 on 6.5s. Link to post Share on other sites More sharing options...
XenonWhite 1st Gear May 18, 2012 Share May 18, 2012 Don't mind it being sluggish as the speedo was registering over 7% faster than Actual GPS speed. At 5th gear, 100km/h, the little fella screaming at 3krpm. I put 195/60 to make it "longer" ratio. Speed match almost zhun zhun already. Not particular about handling, more targetting fuel economy and cruising as I drive to KL 2-3 times a month. Now wondering if its ok to run 185/65/R15 on 6.5s. YOur rims might easily get kerb rash for skinny tires on wider rims... happen to my car.. Link to post Share on other sites More sharing options...
SIM37 3rd Gear May 18, 2012 Author Share May 18, 2012 YOur rims might easily get kerb rash for skinny tires on wider rims... happen to my car.. kerb rash more about careful when parking near kerb right?? I very silowly one. Never touch kerb, never mount or rub kerb also. Link to post Share on other sites More sharing options...
Roberttan 5th Gear May 19, 2012 Share May 19, 2012 Don't mind it being sluggish as the speedo was registering over 7% faster than Actual GPS speed. At 5th gear, 100km/h, the little fella screaming at 3krpm. I put 195/60 to make it "longer" ratio. Speed match almost zhun zhun already. Not particular about handling, more targetting fuel economy and cruising as I drive to KL 2-3 times a month. Now wondering if its ok to run 185/65/R15 on 6.5s. are you referring your car speedo 107km/h your GPS 100km/h ? what make you sure is the GPS accurate? please share your curent tyre size (185/60/15 or 195/60/15) car manufacturer calculate or calibrate speedo base on OE tyre size(185/60/15) NEW and usually i heard they (car maker) make it slight over reading. As your question can put 195/60/15 if your idea is what you had mentioned just go head as you like because you dont care one Link to post Share on other sites More sharing options...
Gee 1st Gear May 19, 2012 Share May 19, 2012 For R15 from 195/60 to 185/65 the difference is about 1% both in overall diameter and actual speed. After change, 100kph will equal to 98.9kph. Link to post Share on other sites More sharing options...
SIM37 3rd Gear May 21, 2012 Author Share May 21, 2012 are you referring your car speedo 107km/h your GPS 100km/h ? what make you sure is the GPS accurate? please share your curent tyre size (185/60/15 or 195/60/15) car manufacturer calculate or calibrate speedo base on OE tyre size(185/60/15) NEW and usually i heard they (car maker) make it slight over reading. As your question can put 195/60/15 if your idea is what you had mentioned just go head as you like because you dont care one I've calibrated my speedo to 3 different GPS systems and with my mobile phone as well. I also use one GPS based system for my bicycle. Consistantly the stock wheels 185/60/15 always overstates the speed 5-6% according to car speedo. When I switched it to 195/60/15, the OD of the wheel increases and I get a close match to the GPS vs Speedo reading but speedo still slightly overstates. I know 185/65/15 can match it even closer, but the only issue is that now my rims are not stock, the width is 6.5 now. Besides kerb rash, the only other concern now is that will a 185/65/15 be too skinny for 6.5 rims. Link to post Share on other sites More sharing options...
Timbuktu Clutched May 21, 2012 Share May 21, 2012 As per topic, wanna reduce width of tyre. Does anyone know if its possible? I've calculated the OD, slightly larger, so ok, but the rim width on 185, is it safe to do so? Why? You want to reduce road NVH? But you will lose on grip and turn-in. Link to post Share on other sites More sharing options...
SIM37 3rd Gear May 21, 2012 Author Share May 21, 2012 Why? You want to reduce road NVH? But you will lose on grip and turn-in. I don't drive fast, in fact, very economically and rarely above 100km/h in sg. In My, hardly above 120km/h so any normal stock tyre is ok for me. Link to post Share on other sites More sharing options...
Colin03 4th Gear May 21, 2012 Share May 21, 2012 Should not be an issue except you must keep your tyres inflate at a higher density. you can test it out when you turn corner. Link to post Share on other sites More sharing options...
SimonTan 2nd Gear May 21, 2012 Share May 21, 2012 Some 185 has 'wider' ground contact. Some 195 has 'narrower' ground contact. So it's not easy to say. Best to go shop, ask them to fit on the 185 tyre and see whether the 'shape' looks ok or not. If no problem, then buy 4 pieces. Else keep to 195. Most tyre shops will entertain the request as you will be buying 4 tyres from them eventually, as promised. Link to post Share on other sites More sharing options...
Roberttan 5th Gear May 23, 2012 Share May 23, 2012 I've calibrated my speedo to 3 different GPS systems and with my mobile phone as well. I also use one GPS based system for my bicycle. Consistantly the stock wheels 185/60/15 always overstates the speed 5-6% according to car speedo. When I switched it to 195/60/15, the OD of the wheel increases and I get a close match to the GPS vs Speedo reading but speedo still slightly overstates. I know 185/65/15 can match it even closer, but the only issue is that now my rims are not stock, the width is 6.5 now. Besides kerb rash, the only other concern now is that will a 185/65/15 be too skinny for 6.5 rims. my POV most important one is to Match Traffice Polish speed trap equipment. otherwsie you will be FINE for speeding Why are you want to be so perfect ? Link to post Share on other sites More sharing options...
Ckchong8 1st Gear May 25, 2012 Share May 25, 2012 my POV most important one is to Match Traffice Polish speed trap equipment. otherwsie you will be FINE for speeding Why are you want to be so perfect ? Can match the one given by LTA especially on the exit like the one exit to Tampines Safara from PIE towards Changi airport or there is another one PIE towards Jurong exit to clementi. ↡ Advertisement Link to post Share on other sites More sharing options...
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