Well, its totally up to the owner if he wants to upgrade the brakes or not. My yamaha junoon had a faulty drum that would literally eat brake shoes... the braking was also poor.
But i got used to it, I drove the bike with same stopping power for 4 years and just recently got a new sleeve from kharadia...
Braking is much better now, previously i had to almost stand on the rear brakes to make the wheel jam... as if it had a built in abs system. Lol.. the brake's response time was very poor.
But now i can get full stopping power on just a touch of the pedal.. im also more prone to slipping and loosing tread of my rear tire now.
If u'd be driving on a highway... i recommend keep ur front brakes drum.. but always adjusted to the best! Give immediate attention if ur front brake's response time isnt good. (Bad brake shoes that develop shine, brake cable that stucks, brake lever play adjustment all should be well taken care of)
For rear brakes... well a fatter tire should do it, check the drum for factory defect and get a sleeve if required. Check both drums..
Most braking problems in today's bikes are due to low quality drums which in result destroy braking capabilities of ur brake leathers... (Shine/uneven wear/hardens the shoes etc.)
Im not in favor of disk in GS... bcoz most other bikes on road don't have any brakes at all... and car walas aren't paying any attention on the road... over efficient brakes can get u hit from behind really bad. Specially on a highway... (i just have drum brakes but im busy saving my **** from getting hit all the time by car walas, since i have rear view mirrors i know most people are driving without any attention)
Hence imho.. just try and fix the current set up to the best, u can add a bit wider tire just as a support...
Spending 10-15ks isnt that wise..
Bike is new and don't put a wider tire yet, it might over load ur engine. Experiment after at least 2k kms
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