Petal disc vs Round disc - xBhp.com : The Global Indian Biking Community

ron_7933 · 11-08-2009, 01:25 AM

Can anyone tell me how do the round and petal disc differ, apart from the obvious shape? Which one is better and why?

Sunny · 11-08-2009, 04:38 AM

Topic Approved

remortr · 11-08-2009, 04:48 AM

round or petal that is none of matter i think diameter and calipers are important .correct me if i am wrong

singhupinder · 11-08-2009, 05:25 AM

The petal brakes reduce the unsprung weight of the bike and also provide better heat dissipation needed to maintain brake feel and responsiveness during extended heavy use..

jd666 · 11-08-2009, 07:27 AM

^^ he said it...

Mindgrinder · 11-08-2009, 07:57 AM

Quote:

Originally Posted by singhupinder

The petal brakes reduce the unsprung weight of the bike and also provide better heat dissipation needed to maintain brake feel and responsiveness during extended heavy use..

could u explain how?

fayad555 · 11-08-2009, 08:53 AM

a petal disc has more surface area for heat dissipation than that in a normal round disc of same diameter. So it increases the effeciency and life of the disc and the disc-pads.
weight of the petal disc is also less compared with a round disc..it adds to performance..
So petal discs are always better..

jd666 · 11-08-2009, 08:59 AM

If you draw a complete circle and consider that a disc ok?

now start making small triangles on the circumference of the circle, ( close to the shape of the notches that are there on a petal type disc). All of that is material removed from the disc, which being of high grade steel, helps reduce the weight.

The slightest of weight reduction at the wheel, will lower the rotational momentum, ie. a wheel with a higher rotational momentum, will change direction slowly or will require more force. A wheel with a lower rotational momentum will require lesser effort, and will be more responsive in terms of handling .

Morever the notches increase the effect surface area at the rim of the disc, hence causing better heat dissipation to the air flowing over the disc.

And finally, a petal disc looks any day better than a normal disc!! lol!!

antz.bin · 11-08-2009, 09:16 AM

So why bajaj/hh people dont use petal discs and only TVS people do.

jd666 · 11-08-2009, 09:37 AM

^^ cost of manufacturing.

11-08-2009, 01:25 AM	#1 (permalink)
ron_7933 roAdbl/-\z3r Join Date: Jan 2009 Location: Halfway between the road n da starz :D Posts: 109	Petal disc vs Round disc Can anyone tell me how do the round and petal disc differ, apart from the obvious shape? Which one is better and why?

11-08-2009, 04:38 AM	#2 (permalink)
Sunny SlowMotionInfinity Join Date: Apr 2002 Location: Delhi Posts: 6,824	Topic Approved __________________ Join xBhp On

11-08-2009, 07:27 AM	#5 (permalink)
jd666 Senior Member Join Date: Sep 2009 Location: Gurgaon/Faridabad Posts: 3,320	^^ he said it... __________________ The latest RXZ rebuild pics, updated July 2011 - http://www.xbhp.com/talkies/thumpers...tml#post669927 My offerings to the gods of speed - - Yamaha R15 - Yamaha RXZ 5 speed

11-08-2009, 08:53 AM	#7 (permalink)
fayad555 Senior Member Join Date: Jul 2009 Location: Trivandrum Posts: 474	a petal disc has more surface area for heat dissipation than that in a normal round disc of same diameter. So it increases the effeciency and life of the disc and the disc-pads. weight of the petal disc is also less compared with a round disc..it adds to performance.. So petal discs are always better.. __________________ tђє รเlєภt รt๏г๓

11-08-2009, 08:59 AM	#8 (permalink)
jd666 Senior Member Join Date: Sep 2009 Location: Gurgaon/Faridabad Posts: 3,320	If you draw a complete circle and consider that a disc ok? now start making small triangles on the circumference of the circle, ( close to the shape of the notches that are there on a petal type disc). All of that is material removed from the disc, which being of high grade steel, helps reduce the weight. The slightest of weight reduction at the wheel, will lower the rotational momentum, ie. a wheel with a higher rotational momentum, will change direction slowly or will require more force. A wheel with a lower rotational momentum will require lesser effort, and will be more responsive in terms of handling . Morever the notches increase the effect surface area at the rim of the disc, hence causing better heat dissipation to the air flowing over the disc. And finally, a petal disc looks any day better than a normal disc!! lol!! __________________ The latest RXZ rebuild pics, updated July 2011 - http://www.xbhp.com/talkies/thumpers...tml#post669927 My offerings to the gods of speed - - Yamaha R15 - Yamaha RXZ 5 speed

11-08-2009, 04:48 AM	#3 (permalink)
remortr Senior Member Join Date: Mar 2009 Location: erode Posts: 113	round or petal that is none of matter i think diameter and calipers are important .correct me if i am wrong

11-08-2009, 05:25 AM	#4 (permalink)
singhupinder Junior Member Join Date: Nov 2009 Posts: 6	The petal brakes reduce the unsprung weight of the bike and also provide better heat dissipation needed to maintain brake feel and responsiveness during extended heavy use..

11-08-2009, 09:16 AM	#9 (permalink)
antz.bin Senior N00B Join Date: Jul 2009 Location: Nasik / Pune Posts: 2,123	So why bajaj/hh people dont use petal discs and only TVS people do.

11-08-2009, 09:37 AM	#10 (permalink)
jd666 Senior Member Join Date: Sep 2009 Location: Gurgaon/Faridabad Posts: 3,320	^^ cost of manufacturing. __________________ The latest RXZ rebuild pics, updated July 2011 - http://www.xbhp.com/talkies/thumpers...tml#post669927 My offerings to the gods of speed - - Yamaha R15 - Yamaha RXZ 5 speed

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