Brake Disc thickness - SV650.org

14-11-06, 10:03 AM

Kind of following on from a previous post about brake disc life expectancy, Ive just received the brake discs I got from eBay through the post. I've measured them and they are 5.1mm thick. The disc says min thickness 4.5mm. Anyone know what thickness they are (or could be) when new? The ebay add said they were from a very low mileage bike with v little wear.

Cheers

TSM · 14-11-06, 10:12 AM

It would have to be very low millage for that thickness, are to mesuring it in the middle of the friction area and at several places around the disk. Idealy you need a micrometer for it.

14-11-06, 10:15 AM

I used vernier calipers. Yep I measured at four different places around the disc. Are you saying they are quite thick hence not used that much???

21QUEST · 14-11-06, 10:15 AM

Quote:

Originally Posted by andyb

Kind of following on from a previous post about brake disc life expectancy, Ive just received the brake discs I got from eBay through the post. I've measured them and they are 5.1mm thick. The disc says min thickness 4.5mm. Anyone know what thickness they are (or could be) when new? The ebay add said they were from a very low mileage bike with v little wear.

Cheers

4.5mm stamped on the dics is recommended minimum thickness. Thickness from new varies on different bikes/discs. Those are probably 5mm new.

What did you used to measure the thickness? If there is no lipping on the discs or you have not included any if present then you done good.

Cheers
Ben

TSM · 14-11-06, 10:24 AM

Verniers are probably not correct as they will mesure the lip of the disk being the thickest part of the disk.

21QUEST · 14-11-06, 10:30 AM

Quote:

Originally Posted by TSM

Verniers are probably not correct as they will mesure the lip of the disk being the thickest part of the disk.

Nah..Verniers should be fine. The upper part the the jaws have a gap built in which would miss any normal lipping.

Cheers
Ben

TSM · 14-11-06, 10:43 AM

Quote:

Originally Posted by 21QUEST

Quote:

Originally Posted by TSM

Verniers are probably not correct as they will mesure the lip of the disk being the thickest part of the disk.

Nah..Verniers should be fine. The upper part the the jaws have a gap built in which would miss any normal lipping.

Cheers
Ben

It depends on how large the gap is and the thickness on the other parts of the disk. But under most circumstances it should be fine.

14-11-06, 10:49 AM

Boy did good! Theres no lipping and they are about 5mm thick

I've also just purchased me some TL1000S clip-ons!!! Will give them a go and see what theyre like for the new front end!

14-11-06, 10:03 AM	#1
andyb Guest Posts: n/a	Brake Disc thickness Kind of following on from a previous post about brake disc life expectancy, Ive just received the brake discs I got from eBay through the post. I've measured them and they are 5.1mm thick. The disc says min thickness 4.5mm. Anyone know what thickness they are (or could be) when new? The ebay add said they were from a very low mileage bike with v little wear. Cheers

14-11-06, 10:12 AM	#2
TSM The Sick Man Mega Poster Join Date: Nov 2004 Location: Peckham.SE.LDN Posts: 4,768	It would have to be very low millage for that thickness, are to mesuring it in the middle of the friction area and at several places around the disk. Idealy you need a micrometer for it. __________________ OTR: KTM 690 Duke R 2015 Full Akro SIDELINE: Kwak ZX636 A1P 2002, Red, R&G's, Yoshi, Double Bubble Screen GONE: Kwak ZX-7R P1, Full Akro, Undertray, Screen GONE: SV650S K2 Very Bruised & Without Fairing, Motovation Frame Sliders, R&G Ally Sprocket Toe Protector, HEL 2 Line Setup, GSXR K1 600 RWU Forks, Barnett Clutch & Springs, Penske 8981 Shock, Gilles Ti Rearsets, Steel Barends, Scottoiler, AFAM Chain & Sprockets, Twin FIAMM Horns, Skidmarx Bellypan, Full Micron Zeta Steel System, Cut down undertay. Forum Problems & Information / Site Suggestions

14-11-06, 10:24 AM	#5
TSM The Sick Man Mega Poster Join Date: Nov 2004 Location: Peckham.SE.LDN Posts: 4,768	Verniers are probably not correct as they will mesure the lip of the disk being the thickest part of the disk. __________________ OTR: KTM 690 Duke R 2015 Full Akro SIDELINE: Kwak ZX636 A1P 2002, Red, R&G's, Yoshi, Double Bubble Screen GONE: Kwak ZX-7R P1, Full Akro, Undertray, Screen GONE: SV650S K2 Very Bruised & Without Fairing, Motovation Frame Sliders, R&G Ally Sprocket Toe Protector, HEL 2 Line Setup, GSXR K1 600 RWU Forks, Barnett Clutch & Springs, Penske 8981 Shock, Gilles Ti Rearsets, Steel Barends, Scottoiler, AFAM Chain & Sprockets, Twin FIAMM Horns, Skidmarx Bellypan, Full Micron Zeta Steel System, Cut down undertay. Forum Problems & Information / Site Suggestions

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14-11-06, 10:15 AM	#3
andyb Guest Posts: n/a	I used vernier calipers. Yep I measured at four different places around the disc. Are you saying they are quite thick hence not used that much???

14-11-06, 10:49 AM	#8
andyb Guest Posts: n/a	Boy did good! Theres no lipping and they are about 5mm thick I've also just purchased me some TL1000S clip-ons!!! Will give them a go and see what theyre like for the new front end!