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27th May 2022
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XL FORUM TEAM MEMBER
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Join Date: Jul 2008
Location: Coastal BC
Posts: 1,524 Sportster/Buell Model: shovester project Sportster/Buell Year: 80s Other Motorcycle Model: Kawasaki kz440 Other Motorcycle Year: 1983
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What kind of brake disk to get
It looks like I need a new front brake disk before I put get my bike back on the road:
It’s a good opportunity to upgrade to the type of disk that works with modern pads (sintered?). What is the type of disk I would need for this upgrade and is it worth it?
This is on a ‘85 fork leg (single disk) |
27th May 2022
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Biker
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Join Date: May 2022
Posts: 22 Sportster/Buell Model: Sportster Sportster/Buell Year: 1998
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Get yourself a good floating rotor.
OEM Harley Rotors are good.
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27th May 2022
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XL FORUM TEAM MEMBER
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Join Date: Jul 2008
Location: Coastal BC
Posts: 1,524 Sportster/Buell Model: shovester project Sportster/Buell Year: 80s Other Motorcycle Model: Kawasaki kz440 Other Motorcycle Year: 1983
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Hmm, if we already have floating calipers, is there an advantage to floating rotor compared to fixed rotor?
And I see pretty much all disks these days are stainless steel, is it stainless that’s needed to be compatible with scintered pads? Or do I have to be concerned about grade of stainless used?
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27th May 2022
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Biker
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Join Date: May 2022
Posts: 22 Sportster/Buell Model: Sportster Sportster/Buell Year: 1998
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reduced vibration...
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27th May 2022
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XL FORUM LIFE MEMBER
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Join Date: Jan 2009
Location: In a swamp/Michigan
Posts: 16,474 Sportster/Buell Model: XL1460C Sportster/Buell Year: 2000 Sportster/Buell Model #2: XL1200R Sportster/Buell Year #2: 2006 Other Motorcycle Model: XL1200R Other Motorcycle Year: 2004
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More even pad wear at times........
__________________
Pleasing everyone is impossible but pissing everybody off is a piece of cake! 
Everything happens for a reason. Sometimes the reason is that you’re stupid and you make bad decisions..... 
The XL Forum Sportsterpedia:
http://sportsterpedia.com/doku.php/start
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28th May 2022
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Senior Master Custom Bike Builder
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Join Date: Jun 2008
Location: Cornelius, OR
Posts: 10,091
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The rotor floats for a different reason/function than the caliper floating.
A floating rotor pretty much keeps its shape, when a fixed mounted rotor expands it turns into a potato chip and splits due to thermal stresses.
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28th May 2022
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MetalWorkingXLFan
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Join Date: Jun 2011
Location: Far West Texas
Posts: 702 Sportster/Buell Model: XL1200V Sportster/Buell Year: 2013 Sportster/Buell Model #2: KHK Sportster/Buell Year #2: 1954 Other Motorcycle Model: Valkyrie Other Motorcycle Year: 97
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This is an 11.5, 2.0 bore 3.25 bolt circle that fits a 9 spoke19” aluminum wheel. IIRC it’s off an’84 FXEF. Owner did most of one season and then had me swap everything to a dual disk wide glide.
I got the leftovers. Never did anything with it, most likely never will.
If you can use this, pay me shipping and I’ll drop it at the PO on my way to Tractor Supply. Give me a reason to go there .😜
__________________
'54 KHK (Current Build), '13 XL”72” Hard Candy, '97 Honda Valkyrie. I’m Retired 🥃
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28th May 2022
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XL FORUM TEAM MEMBER
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Join Date: Jul 2008
Location: Coastal BC
Posts: 1,524 Sportster/Buell Model: shovester project Sportster/Buell Year: 80s Other Motorcycle Model: Kawasaki kz440 Other Motorcycle Year: 1983
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Thanks Tim. I’m 99% sure that’s the exact same disk as what I have now. And since funds are tight, I’ll be happy to take it off your hands and maybe some other time I’ll upgrade.
The trouble is I live in canada and shipping can be quite expensive. I don’t know if you can check the gist of shipping online or something before going to the trouble of packing it up. I’ll pm you my address. If it costs more than $35 it probably not worth it.
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28th May 2022
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XL FORUM TEAM MEMBER
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Join Date: Jul 2008
Location: Coastal BC
Posts: 1,524 Sportster/Buell Model: shovester project Sportster/Buell Year: 80s Other Motorcycle Model: Kawasaki kz440 Other Motorcycle Year: 1983
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On second thought I think I will not use Tim the Grim’s rotor. It’s the same as mine and Prone to the same cracking. I saw another identical rotor in the evo section with similar (but worse cracks). If floating disks will make it less of a potato chip and less likely to crack I’ll look for a cheap oem take-off.
Last edited by billeuze; 29th May 2022 at 04:34..
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28th May 2022
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Biker
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Join Date: May 2022
Posts: 22 Sportster/Buell Model: Sportster Sportster/Buell Year: 1998
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You will not regret the investment.
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