cracked disk

[colezxr]

when looking over my bike yesterday i noticed that there is three little cracks in my rear disk, doas anyone know what could have caused them it hasnt to my knowledge had any impacts to it.
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Its better to live your life for one hour as a tiger, Than it is to live your whole life like a worm.
past: gilera dna125. kawasaki zxr400h1, honda cbr 900rrr fireblade (currently being sold for parts). present honda hornet 900

[carlnicholson...]

Can just happen with heat and wear. They get proper hot when used, and so expand, then with the nuclear winter we have had, cool right down to below freezing, then get used and red hot again and so forth.

If they are worn quite a bit, then they will be weaker anyway, it's just one of them things. Looks like a new disk is in order mate.
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"THOSE WHO RISK NOTHING, DO NOTHING, ACHIEVE NOTHING, BECOME NOTHING."

[colezxr]

i hardly even use the rear brake only when its wet
____________________
Its better to live your life for one hour as a tiger, Than it is to live your whole life like a worm.
past: gilera dna125. kawasaki zxr400h1, honda cbr 900rrr fireblade (currently being sold for parts). present honda hornet 900

[carlnicholson...]

The disc may just be properly old then. I would definatley replace it though. If the cracks lead to a bit of the disk becoming pronounced, it then may catch on the brake pad with potentially scary concequences.

Case of cough up and look happy mate.
____________________
"THOSE WHO RISK NOTHING, DO NOTHING, ACHIEVE NOTHING, BECOME NOTHING."