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just measured the crack on the old discs.

its at least 0.75mm deep, groove slots on that side is 1mm, disc thickness is 25.34mm
even if one side of the disc was machined down to eliminate the crack it would still be least 24.34mm
min thickness is 23.9mm so only 0.45mm of usable metal left
so i think these old discs are scrap and prob not worth risking selling on

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i didn't like the whiteness of my helmet especially if i wear it on the road and stick out like a sore thumb. so sanded it down

[ATTACH=full]37158[/ATTACH]

didn't have much acrylic matt black but got black vinyl paint, that'll do. light dusting first

[ATTACH=full]37159[/ATTACH]

then thicker complete coat

[ATTACH=full]37160[/ATTACH]

dried and looks the biz

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<blockquote data-quote="pollyp" data-source="post: 516111" data-attributes="member: 4527">just measured the crack on the old discs.its at least 0.75mm deep, groove slots on that side is 1mm, disc thickness is 25.34mmeven if one side of the disc was machined down to eliminate the crack it would still be least 24.34mmmin thickness is 23.9mm so only 0.45mm of usable metal leftso i think these old discs are scrap and prob not worth risking selling on[ATTACH=full]37157[/ATTACH] i didn&#039;t like the whiteness of my helmet especially if i wear it on the road and stick out like a sore thumb. so sanded it down[ATTACH=full]37158[/ATTACH] didn&#039;t have much acrylic matt black but got black vinyl paint, that&#039;ll do. light dusting first[ATTACH=full]37159[/ATTACH] then thicker complete coat[ATTACH=full]37160[/ATTACH] dried and looks the biz<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite13" alt=":)" title="Smile&nbsp; &nbsp; :)" loading="lazy" data-shortname=":)" />[ATTACH=full]37161[/ATTACH]</blockquote>

[QUOTE="pollyp, post: 516111, member: 4527"] just measured the crack on the old discs. its at least 0.75mm deep, groove slots on that side is 1mm, disc thickness is 25.34mm even if one side of the disc was machined down to eliminate the crack it would still be least 24.34mm min thickness is 23.9mm so only 0.45mm of usable metal left so i think these old discs are scrap and prob not worth risking selling on [ATTACH=full]37157[/ATTACH] i didn't like the whiteness of my helmet especially if i wear it on the road and stick out like a sore thumb. so sanded it down [ATTACH=full]37158[/ATTACH] didn't have much acrylic matt black but got black vinyl paint, that'll do. light dusting first [ATTACH=full]37159[/ATTACH] then thicker complete coat [ATTACH=full]37160[/ATTACH] dried and looks the biz:) [ATTACH=full]37161[/ATTACH] [/QUOTE]

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