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Originally posted by Samarth 619
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Guys, Let's start with the basic info.
Gearing is a measure of all the components that determine the rate at which an engine's crankshaft's revolutions are transmitted, into the vehicle's speed. It comes from the word "gears" which are rotating cogs, which decide what speed the machine picks up, at a particular rpm.
Sprocketing means changing the front & rear sprocket sizes to affect gearing. It's one of the simplest and easiest mods. The basic info says that:-->
1. Bigger rear sprocket or smaller front sprocket, results in gearing biased towards acceleration, with some lag in top speed.
2. Smaller rear sprocket or bigger front sprocket, results in gearing biased towards top speed, with some lag in acceleration.
Gearing does NOT result in more or less power. It only affects how the power is laid, by changing the balance between top speed and acceleration. So, if one wants more top speed, and is prepared to lose acceleration a bit, or vice versa, then sprocketing is advisable.
Taller gearing results in better mileage usually, and short gearing results in less mileage. This is due to the fact, that in longer gearing, the machine travels longer distance for a particular engine speed (rpm), and vice versa.
Gearing maybe affected by: Sprockets' size change, rear tyre's size change, gearbox modification, clutch drag, etc.
Gearing is NOT affected by: Weight/ load change (pillion, etc.), front tyre change, free flow air filters/ power mods, etc.
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Change Measurement: Final Gearing Value: It is the gearing value that indicates contribution to overall gearing from both the sprockets. The sizes of front and rear sprocket, in the measure of teeth the sprockets have, determines the final gearing.
Final gearing is for comparison between different sprocket combos.
It is calculated by Rear Sprocket Teeth/ Front sprocket Teeth. Like Pulsar 180 UG4 has a 14 front and 39 rear setup. So, its stock final gearing is 39/14 which is equal to 2.785.
Higher Final Gearing value signifies moving gearing towards acceleration (short gearing), and vice versa. So, when changing both sprockets from stock, the new gearing value should be calculated to determine which way you're going with gearing.
Tyres: Rear Tyre change (size) affects overall gearing, if the profile (height) is affected due to this change. A higher profile increases gearing, while a lower profile decreases it.
A tyre with size 120/70 has a normal height of (120mm x 70%) which is 84mm. But, the broadness of the tyre rim can change the "final height".
A broader rim gives less tyre height, as tyre is rubber, and it expands over the broader rim. And of course, vice versa too.
Front tyre size change doesn't affect gearing, although it may contribute to different ride height and different speeds on the speedometer.
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Direct Fits:
Apache RTR 160: Stock Setup: 13/44 teeth.
To overgear it, use the 14 teeth front sprocket from Yamaha YZF R15/ Fiero F2. (Thanks Aparajith)
Pulsar 220 DTS Fi (Old model): Stock setup: 14/37
To undergear it, use:
P200's rear sprocket, 38 teeth,
Karizma's rear sprocket, 40 teeth, (Thanks Prafultripathy)
Yamaha YZF R15: Stock Setup: 14/42
To overgear it, use rear sprocket, 40 teeth from Yamaha FZ 16. (Thanks anirudh_fz1)
Yamaha FZ16: Stock Setup: 14/40
To overgear it, use front sprocket, 15 teeth from Honda Unicorn. (Thanks iamvik)
To undergear it, use rear sprocket, 42 teeth from Yamaha YZF R15. (Thanks anirudh_fz1)
Honda Shine 125: Stock Setup: 14/~
To overgear it, use front sprocket, 15 teeth from Honda Unicorn. But, you'll have to shave off the sides of the sprocket so it matches the chain. (Bike India)
Honda Unicorn 1st and 2nd Gen: Stock Setup: 15/42
Honda Unicorn 3rd/4th onwards: Stock Setup: 15/43
Direct Fits - With Chain pitch .428 (Unicorn Chain)
Front 14T from Hero Honda Ambition/CBZ/Xtreme
Rear 38T (Ambition)
Rear 46T (CBZ Classic)
With Chain Pitch .520 (Karizma chain)
13T/40T of Karizma
13T(ZMA)/38T(P200)
Hero Honda Karizma: Stock Setup: 13/40
Rear 38T of P200 (P200 chain length is not sufficient)
(Thanks Shreeni)
EDIT: This topic's incomplete. More material would be added on later. Please suggest improvements to the topic.
-Samarth
Gearing is a measure of all the components that determine the rate at which an engine's crankshaft's revolutions are transmitted, into the vehicle's speed. It comes from the word "gears" which are rotating cogs, which decide what speed the machine picks up, at a particular rpm.
Sprocketing means changing the front & rear sprocket sizes to affect gearing. It's one of the simplest and easiest mods. The basic info says that:-->
1. Bigger rear sprocket or smaller front sprocket, results in gearing biased towards acceleration, with some lag in top speed.
2. Smaller rear sprocket or bigger front sprocket, results in gearing biased towards top speed, with some lag in acceleration.
Gearing does NOT result in more or less power. It only affects how the power is laid, by changing the balance between top speed and acceleration. So, if one wants more top speed, and is prepared to lose acceleration a bit, or vice versa, then sprocketing is advisable.
Taller gearing results in better mileage usually, and short gearing results in less mileage. This is due to the fact, that in longer gearing, the machine travels longer distance for a particular engine speed (rpm), and vice versa.
Gearing maybe affected by: Sprockets' size change, rear tyre's size change, gearbox modification, clutch drag, etc.
Gearing is NOT affected by: Weight/ load change (pillion, etc.), front tyre change, free flow air filters/ power mods, etc.
-----------
Change Measurement: Final Gearing Value: It is the gearing value that indicates contribution to overall gearing from both the sprockets. The sizes of front and rear sprocket, in the measure of teeth the sprockets have, determines the final gearing.
Final gearing is for comparison between different sprocket combos.
It is calculated by Rear Sprocket Teeth/ Front sprocket Teeth. Like Pulsar 180 UG4 has a 14 front and 39 rear setup. So, its stock final gearing is 39/14 which is equal to 2.785.
Higher Final Gearing value signifies moving gearing towards acceleration (short gearing), and vice versa. So, when changing both sprockets from stock, the new gearing value should be calculated to determine which way you're going with gearing.
Tyres: Rear Tyre change (size) affects overall gearing, if the profile (height) is affected due to this change. A higher profile increases gearing, while a lower profile decreases it.
A tyre with size 120/70 has a normal height of (120mm x 70%) which is 84mm. But, the broadness of the tyre rim can change the "final height".
A broader rim gives less tyre height, as tyre is rubber, and it expands over the broader rim. And of course, vice versa too.
Front tyre size change doesn't affect gearing, although it may contribute to different ride height and different speeds on the speedometer.
--------------
Direct Fits:
Apache RTR 160: Stock Setup: 13/44 teeth.
To overgear it, use the 14 teeth front sprocket from Yamaha YZF R15/ Fiero F2. (Thanks Aparajith)
Pulsar 220 DTS Fi (Old model): Stock setup: 14/37
To undergear it, use:
P200's rear sprocket, 38 teeth,
Karizma's rear sprocket, 40 teeth, (Thanks Prafultripathy)
Yamaha YZF R15: Stock Setup: 14/42
To overgear it, use rear sprocket, 40 teeth from Yamaha FZ 16. (Thanks anirudh_fz1)
Yamaha FZ16: Stock Setup: 14/40
To overgear it, use front sprocket, 15 teeth from Honda Unicorn. (Thanks iamvik)
To undergear it, use rear sprocket, 42 teeth from Yamaha YZF R15. (Thanks anirudh_fz1)
Honda Shine 125: Stock Setup: 14/~
To overgear it, use front sprocket, 15 teeth from Honda Unicorn. But, you'll have to shave off the sides of the sprocket so it matches the chain. (Bike India)
Honda Unicorn 1st and 2nd Gen: Stock Setup: 15/42
Honda Unicorn 3rd/4th onwards: Stock Setup: 15/43
Direct Fits - With Chain pitch .428 (Unicorn Chain)
Front 14T from Hero Honda Ambition/CBZ/Xtreme
Rear 38T (Ambition)
Rear 46T (CBZ Classic)
With Chain Pitch .520 (Karizma chain)
13T/40T of Karizma
13T(ZMA)/38T(P200)
Hero Honda Karizma: Stock Setup: 13/40
Rear 38T of P200 (P200 chain length is not sufficient)
(Thanks Shreeni)
EDIT: This topic's incomplete. More material would be added on later. Please suggest improvements to the topic.
-Samarth
i have a Yamaha FZ16. Is the unicorn front 15T sprocket a direct fit to that of the FZ's. Please reply asap.
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