@azharace: I am no tire expert. Nikhil has best idea and with the calculations 185/60R14 was his choice with C drives

175/65 will be big.
I agree with GTO with everything he said, however here is
my view of TD (remember I am reviewing this car for my mother and is the 3rd car in the family after CityZX Vtec 07 and Indica V2 02),
Choice of cars: i10/Ritz/Beat/Spark.
Mum did not like Ritz rear and we are not too serious about Spark for it is aging platform.
I registered for TD of i10, Ritz and Beat on 01/20.
1. Interaction with Sales team:
Hyundai: They never bothered to call back/arrange for TD. I visited the showroom alone but there was no car available for TD. The dealership sales team was not eager to attend as well. They say its a tried and tested vehicle and you can buy without TD. I am not too happy with their approach.
My friend has one and he was very fine that Mum could TD it anytime. So no more going back to the dealership least not this one for sure.
Maruti: They were the first one to return the answer to email, but I think it was an automated response rather than a person writing back. Slow to callback. They call on 01/22 and say Demo vehicle was crashed and is under repair. I wanted to see the VXI variant, but it was out of stock and they can only show me one before it is delivered to someone, meaning I have to be early to showroom and without drive again choose the vehicle can only see the interiors before PDI. Huh!!! Again atleast 1+ month waiting for delivery. The caller on the other hand did not understand English and put me on hold to inquire about everything from her boss. All in all no TD, but can see the interiors and check the quality.
Chevy: First to call back the next morning 01/21. Courteous call center employee who was only there to fix the dealer near our home and nothing more. The conversation was crisp and factual.
01/21 The dealer sales rep calls and is eager to fix up the TD the same day again not too hyper. Nicely she books a convenient time on 01/22 and does not turn up. However, she apologized profusely in sms slang and again fixes up time on 01/23 and reaches perfectly on time. She again apologizes to mother and we are off for a TD.
The cars:
i10 Kappa: on 01/22; Nice interiors with already numerous iterations on road. Exteriors are nice but nothing striking. Nice gear position and steering, EPS is very light. Mum liked it but I somehow like HPS better, dont like the EPS even in Vtec. Ride is bouncy at rear and the legroom is not that great. Remember this is my friends city chariot and he has done few ICE mods in the boot. Unusable boot. He rips the engine (10k kms done already) on NH8 and Mum is uncomfortable on those speeds stilling back. Also she remarked the car has more floating ride than Indica/Vtec. She drives and she revvvs n revvvs hard, I do not rip it as much as she does. But has a grin on her face though she complains about engine noise. Breaking is okish but not to her liking, also the engine breaking is not comparable to diesel engine. I sometimes wonder if I have converted my mother to be a petrohead or the other way around. The doors she says are light and beige not a necessity.
Ritz LXI/VXI/ZXI: on 01/22; The vehicle was still in contention even after the attitude with dealership as I was telling her all about the reviews from TBHP and K12 engine, I was disappointed with the quality, certainly not match to Kappa's. Wish Maruti understands that cars are not meant for 2 years but at-least 5 years. The plastics even though dual tone were not great. Mum already has prejudice against Maruti's (2+ years khadakti (rattling) image, we had 3 Marutis earlier[800/zen/esteem]). Even though the build quality has improved but still not worthy, IMHO MASS saves the cars else these wont last much. So no TD, nice engine (I trust TBHP) but average build quality. Mum also didn't like the rear. The bumper design makes it look even wider than it actually is. Boot was nice/back tray was petty.
Beat: on 01/23; The Cocktail Green car arrives and Mum has a smile, she likes the external rear profile too, Start the engine and it is silent, was idling at 750/800rpm, I initially rip the car towards Manesar and I like the pickup and in gear acceleration, checked for various rpm range from 1500, then 2000, then 3000 and finally 4000 to 5000 wasnt able to go any further as I ran short of the highway (11 km one way). Took the U-turn from Toll plaza and gave it to Mum for ride. One thing that I would like to mention here is that Mum did not know I was doing 100+ and so no instruction from back seat

Nice NVH I must say, tire sound does filter in but the adjacent vehicles sound was minimal. Sorry cant draw comparison with Ritz but this was better than i10. Also the ride in back seat, Mum did not complain, she was ok with the back bench incline, the lower seat could have been on an angle so provide better seating.
Mum starts driving and she doesnt adjust Tilt steering she likes my position of steering (maybe she was not aware), she liked the small steering and weighted feeling of this HPS better than EPS on i10, however she is not a fan of having horn in the middle(its a matter of getting use to), she rips, always keeping the engine above 3k, I check her from back seat and she shifts to higher gear, remarking she did not feel the need or that she did not hear the engine shout, she drives the Vtec and can make out the Vtec in play here no Vtec so I think she will redline this more than Vtec. She likes the seats (she is medium built 5.5 ft) but again she asks me how did I fit in those seats, I am 6 and even though the I could feel the side bolstering I was not uncomfortable as the cushioning is good/better than i10 again (i10 has good seats) this one is a bit smaller but better. She does some sharp turns and also breaks (I forgot to check breaks). Nice bite and she finds it good.
ACC is very nice feature, Nice readable displays in the afternoon sun (today was nice sunny day in Gurgaon), minimal reflection from dash. Again Okish HU output but I will say its only due to the speakers, though I did not pump up to max (forgot the calbe for Aux in for iPod at home, others please check if the HU is iPod compatible, Thanks!). For average user/first time car buyers I will recommend this over aftermarket. For 6 ft person the rear bench is okish, thighsupport was minimal, Spark has better seats, also the curve on the rear bench makes it smaller, ample for two adults with a toddler. I can speak of NCR and for that I think rear windows are good, good that you wont get sunburn and less greenhouse effect, add sun film and I think I can work on my laptop all day long without glare. Ride is way better than i10 and legroom is great. Boot has a light but smaller to other cars.
Rear view mirror adjustment for me was not good, its too low on the windscreen and obstructs some view of the road ahead, ORVMs are odd share as only half is usable and other half slops down making it useless. For Mum she had no complains, I think this is done for shorter drivers and no seat adjust.
As everyone remarked, there is hint of bodyroll but that is not something that might turnoff someone from to take nice cornering speeds. Suspension are soft but make the noise, also the TD vehicle (380 on odo) had some sound constantly coming from the front right suspension when Mum drove that I think is because Mum was trying to pickup the accelerations at far lower rpm range and the engine was lugging. Then again while at speed the sound came with uneven surface, the driver said maybe inspection was not done completely. I would like others to check the suspensions please.
Once we came back, I did a complete check of the engine bay, nicely laid bay, though I think the battery was smaller than Indica's and that of Vtec. Please comment. The quality of wiring and fluid containers were better than Ritz, less solid plastics, I think over time these will also cloud, harden and then crack as in Indica.
Fuel filler is meant for smaller nozzle and I think many filling attendants will scratch the paint work if not focusing. But nice thing is that it is on the driver side. I did not pay attention to this detail in Ritz and i10. Rear wiper is nice and covers good area, not gimmicky, front wipers also cleaned a lot of area and the late last wipe is nice to keep the dripping stream, I did not check the intermediate level. Did not check it on Ritz and i10 either.
Nice quality of rubber beading, and dashboard plastics. Ergonomic design of center console, for 6 ft person you can find your position well and also the left knee wont hurt. Front co-passanger has less space to park the left foot(its on a curve).
Final note: Beat is VFM for city drives also relaxed highway car, boot will restrict the carrying capacity but nice rear seat ride. Nice engine I do not see Mother revving it past 5k where it does develop a grunt and is not too smooth. As enthusiast I find the car to be great for the price package. GM do not change the pricing if you want numbers, Hyundai and Maruti will give discounts if they want to curtail GM else this car is sure success for the company and has huge potential to be best seller.
I will update you about the color choice most probably White but today Mum liked Green too. We have not see white in person.
Hope this long winded review also helps with viewpoint mainly of a lady driver looking for a city car. Do ask me if you wish to know something in detail or if I have skipped something.
Cheers!