Yamaha R One Five (R15) – The Number’s

Yamaha R15

After months of speculation all over the internet in various discussion board/forum, Yamaha has officially announced the much awaited figures of the R15.

With the rumors quoting power of the bike in excess of 20bhp, the official figure stands at 17PS. Reading the response, I believe Yamaha officials were very smart in keeping the figures secret until the last day else the comments like following would have been floating on the various discussion forums for months.

“Just 17PS”

“My XYZ bike makes more power”

“My ABC bike is just behind in power”

After all discussing all about a bike, without even test riding it, is a born right of every internet savy “biker” :-).

Now with the gearing numbers also out, I entered them into my Excel spreadsheet and the numbers I saw were a bit shocking.

Primary Reduction: 3.042

Secondary Reduction: 3.000

Rear Tyre size: 100/80×17

Ratio ->

2.833 1.875 1.364 1.143 0.957 0.84
RPM 1st Gear 2nd Gear 3rd Gear 4th Gear 5th Gear 6th Gear
1000 4.32 6.52 8.97 10.70 12.78 14.56
2000 8.63 13.04 17.93 21.40 25.56 29.12
3000 12.95 19.57 26.90 32.10 38.33 43.67
4000 17.27 26.09 35.86 42.79 51.11 58.23
5000 21.58 32.61 44.83 53.49 63.89 72.79
6000 25.90 39.13 53.79 64.19 76.67 87.35
7000 30.21 45.65 62.76 74.89 89.45 101.90
7500 32.37 48.91 67.24 80.24 95.83 109.18
8000 34.53 52.17 71.72 85.59 102.22 116.46
8500 36.69 55.44 76.20 90.94 108.61 123.74
9000 38.85 58.70 80.69 96.29 115.00 131.02
9500 41.01 61.96 85.17 101.64 121.39 138.30
10000 43.16 65.22 89.65 106.99 127.78 145.58

PS: The above numbers are based on the gearing of the bike. They do not take into account the clutch slip, air drag and other such factors.

Now with the bike making max torque at 7,500rpm (15Nm), the cruising speed can be 109km/hr in top gear. With the max power being made at 8,500rpm (17PS), a speed of 123km/hr should be easily attained. Now these are just numbers, how quickly bike can reach there, will only be known once someone is able to strap a data logging equipment to the bike.

Going by just the numbers, I belive the bike should be able to meet the claims of Yamaha official that this bike will be the fastest amongst all Indian bikes, in straight line.

So, how do these numbers fare against ZMA and Pulsar 220 DTSFi? I’ll put up the charts for those two bikes in next few hours, just for some more number munching. That reminds me, its lunch time now :-).

The official specifications can be found on Yamaha’s website.

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