Maybe this illustration can help to give the problem that I want to share about the rotor in mountain bike. Some people put big rotor in their bike, but other just use standard rotor for their bike, it means that basically there are unwritten rules about installing the rotor for mountain bike. Check this; someone want to change his 26 inch bike with 29er, and he has a problem about choosing the rotor. He heard that big rotor is better than small rotor for his bike. So, finally he installed the big rotor for his bike.
To respond the case above, we have to know first that the many manufacturers offer several rotor size, like SRAM with 140mm, 160mm, 170mm, 180mm, and 200mm. Similar with Shimano with several size option of the rotor. In fact, rider confuses first to choose the rotor, especially for beginners that want to be stylish with their bike, without thinking the performance. It similar with when you put a 180mm fork in you cross country bike. It looks strong, it is, but the fork will lose its function as "hardcore" fork, because 180mm fork usually used in downhill riding, and cross country uses fork in the range 100-120mm.
First to know about big rotor, that big rotor will give effect for the adaptor which is become heavier and have bigger possibility to rubbing, or the condition when the component inside the caliper get a friction and make such sound, thought it does not effect to the performance. So, based on the case above, a 180mm rotor can be placed in the 29er bike. But, there are some considerations for the rider how to choose the rotor for the bike:
What is the Bike?
It may become the basic consideration for every rider want to install rotor in the bike. When you have cross country bike, a 160mm is recommended; in different case you can put 180mm rotor for your XC bike, like you have more weight. A 180mm front and 160mm rear, can be option for your light suspension bike. For more extreme riding like downhill you can add the 200mm rotor for both front and rear. Look also the frames, some frames are designed for big rotor, but others just for small rotor.
How Much Your Weight?
This is simple, if you are heavyweight rider, just like 90kg or more you can consider to install bigger rotor size. Small rider will be comfortable with small rotor.
Consider the Track
Consider the track you want to go with your bike. If there are long down way, you can put bigger rotor to get better performance, and also bigger rotor can release the heat in the rotor. But if you ride on road, like in the park or smooth surface without something make your bike "sweat", just use small rotor.
What Kind of Rider You Are?
For uphill fans and want to enjoy the down way, like the Enduro AM, bigger rotor can be your choice. The last thing I'm sure that every rider has understand. But the most important, check all your bike parts to ensure that your bike is ready to rock. Small error can make another damage in other components, and you don't want that happen. Don't forget to wear helmet also, by the way.
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