[predatorwheelz]

Originally Posted by amit_mechengg

Reasons for not upsizing:
1. Tried 13" alloys. with 2 heavy people and going at 45 degrees on speed breaker the wheel scraped. tried 2-3 models still they scrapped.

3. i believe that lowering the car handles well than increasing the height. so i dont believe the people who claim that the handling improved by increasing 1" i.e from 12" to 13" .

@Amit_mechengg,

A little clarification. When one upsizes from 12" to 13", the handling improves because the profile of the tyre decreases. Typically a 12" tyre on an Alto will have a 80 profile, while 13" will have 65 or 60 profile. The lower profile means thinner sidewalls, hence lower sidewall flex at high speeds. This is why the handling improves.

Lowering the car will obviously improve handling, due to lowering of the Centre of Gravity. But it will lead to other problems, like scraping on a speed breaker when loaded.

Also, I dont understand how a shift to 13" wheels led the car to scrape a speedbreaker. What profile were you trying out?

@Thelord - You're welcome for taking my suggestion! (I'm shameless)

[breezydrive]

Originally Posted by amit_mechengg

deciding against the upsize went for michelins 155/65 R12

so i dont believe the people who claim that the handling improved by increasing 1" i.e from 12" to 13" .

You have actually downsized your wheels

Tyre profile -- Wheel diameter (mm)

145/80R12 ( stock Alto) -- 536.8

155/65R13 ( preferred upgrade) -- 531.7

155/65R12 ( opted by you) -- 506.3

145/70R12 ( stock M-800) -- 507.8

So, your upgrade is even lesser in size than Maruti 800's stock size.
A gross error of 5.4%, be ready for suspension related problems after 5-10K km.

Now, people claiming improvement in handing by increasing the rim size compensate it by reducing the side profile for retaining the same overall diameter ( max. 2-3% variation).

So, it is upto you whether you believe it or not?

[Technocrat]

How are you calculating the wheel Dia?

12 inch = 304.8 millimeter

145/80 = 80% of 145 = 116mm

Am I missing something?

[amit_mechengg]

Originally Posted by predatorwheelz

@Amit_mechengg,
A little clarification. When one upsizes from 12" to 13", the handling improves because the profile of the tyre decreases. Typically a 12" tyre on an Alto will have a 80 profile, while 13" will have 65 or 60 profile. The lower profile means thinner sidewalls, hence lower sidewall flex at high speeds. This is why the handling improves.

Lowering the car will obviously improve handling, due to lowering of the Centre of Gravity. But it will lead to other problems, like scraping on a speed breaker when loaded.

Also, I dont understand how a shift to 13" wheels led the car to scrape a speedbreaker. What profile were you trying out?

yes i had the tyre flex in mind. but the thing is 13" plus the spacer = raised height equation didnt go for me. also the dealer didnt recommend.
the car doesnt scrape the speedbreaker. the tyres scrap the wheel arc.

Originally Posted by breezydrive

You have actually downsized your wheels

Tyre profile -- Wheel diameter (mm)

145/80R12 ( stock Alto) -- 536.8

155/65R13 ( preferred upgrade) -- 531.7

155/65R12 ( opted by you) -- 506.3

145/70R12 ( stock M-800) -- 507.8

So, your upgrade is even lesser in size than Maruti 800's stock size.
A gross error of 5.4%, be ready for suspension related problems after 5-10K km.

Now, people claiming improvement in handing by increasing the rim size compensate it by reducing the side profile for retaining the same overall diameter ( max. 2-3% variation).

So, it is upto you whether you believe it or not?

opps sorry my mistake its 155/70 R12. ---- 521.71

for an alto you have to compensate a more than just the side wall thickness. there is a height difference of just 8 mm on the side wall between 155/70 R12 and 155/65 R13.

And if you add spacers to them and increase the height of your ride it will lead to stability problems.

yes one should believe when they try both the configurations on their altos. so that you can believe what you experience. some hard suspension altos dont scrape while some with soft scrap i.e the tyres scrap the wheel arcs.

[Technocrat]

Originally Posted by Technocrat

How are you calculating the wheel Dia?

12 inch = 304.8 millimeter

145/80 = 80% of 145 = 116mm

Am I missing something?

Oops I now got it what I was missing

[jathin]

The Bridgestone India website offers the following sizes as optional sizes for the Alto:

S322 155/65R13 73S Tube Type
GIII 165/60R12 71H Tubeless
GIII 175/60R13 77H Tubeless

For optional sizes, it is advised to check the tyres for body touching after fitment or any other problem.

You may check their website for details:

Indian Tyres, Tyre market, Global Tyre companies

[AnonymousCoward]

Hi folks,

While upgrading the tyre size of Alto from 145/80/12 to 155/65/13, as the RR (rotating radius) decreases (from 268.4mm to 265.85mm), will this result in reduction of GC (ground clearance)?

Thanks!

[AnonymousCoward]

Originally Posted by AnonymousCoward

Hi folks,

While upgrading the tyre size of Alto from 145/80/12 to 155/65/13, as the RR (rotating radius) decreases (from 268.4mm to 265.85mm), will this result in reduction of GC (ground clearance)?

Thanks!

*bump*... any info ?

Also, does anyone know if the Plati/League alloys come in 4.5J/5J width in size 13? Thanks!

[mithun]

Originally Posted by AnonymousCoward

Hi folks,

While upgrading the tyre size of Alto from 145/80/12 to 155/65/13, as the RR (rotating radius) decreases (from 268.4mm to 265.85mm), will this result in reduction of GC (ground clearance)?

Thanks!

Yes, surely you GC will reduce by 2.55mm.

[AnonymousCoward]

Originally Posted by mithun

Yes, surely you GC will reduce by 2.55mm.

Thanks Mithun - but is it 2.55mm or 2.55mmx2 since the former is Rotating Radius?

[jkdas]

Someone I know want to sell off his old Aura alloys that he has on his Alto as the tyres scrapes with 5 people and luggage.

I was quoted 8k for 5 alloys and a almost new MRF tyres ( I forgot if it was 165 or 155 and the rest of the specs).

Now, I would love to get 165 for my Alto. Can it be done with the Aura one's? Its 4.5J .

1) My car wont be used to carry 5 people , mostly 2 within city
2) If not 165, 155 which?
3) If 4 people which is safer? This will NEVER be a highway car.
4) Its an LXi

[Vid6639]

JK go for 155/65-13 in XM1+ or Turanza ER-60.

Akroy had them on his Alto. He also had 13" aura alloys.

2006 Alto LXi - akroy's Photo Gallery - Team-BHP

[Nikhilb2008]

4.5j is ok for 165. No worries.

[jkdas]

Originally Posted by vid6639

JK go for 155/65-13 in XM1+ or Turanza ER-60.

Akroy had them on his Alto. He also had 13" aura alloys.

2006 Alto LXi - akroy's Photo Gallery - Team-BHP

Originally Posted by Nikhilb2008

4.5j is ok for 165. No worries.

Thanks Vid and Nikhil.

I would love the 165 as it should give a mean look. Any idea about the pricing of 155 and 165?

And 155/65 and 165/60 ?

[AnonymousCoward]

Originally Posted by jkdas

Thanks Vid and Nikhil.

I would love the 165 as it should give a mean look. Any idea about the pricing of 155 and 165?

And 155/65 and 165/60 ?

JK, I think (someone can confirm) that GC will be reduced by 8mm+ in 165/60 and 5mm in 155/65. Hope you are OK with that much reduction in GC in 165/60 option.