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Ironhead Sportster Motorcycle Talk (1957-1985) For all those that wanna talk about Ironhead Sportster Motorcycles

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  #11  
Old 1 Week Ago
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Quote:
Originally Posted by spiritof67 View Post
I am looking into upgrading the front brake setup on my rider XLCR. The PM 4-piston caliper/cast iron disc setup I'm using is better than stock but marginal in the real world. It needs larger diameter discs. Has anyone run larger rotors on the '77 style wheel who can advise me? No lifestyle advice ("Ride it slower") please.
i agree the 10"ers suck.
check out harley pn 44136-84. 11.5 inches
used on 84- 85 xl, 83 xr1000.
use the same bolt pattern as your 77 hub.

they uses different bolts head.
also has a larger bore to register to hub.
(ive installed rings to make up the difference, and also just bolted them up with no ring. no issues either way).

think they maybe a little thicker?? (+.020" cant remember for sure).
thats of no consequence to you as you will need different caliper hangers.
change caliper hanger thickness if ness.

when i used this set up with 4piston pm's (125x4) i used the pm -84 replacement iron rotors i learned this:
when calipers were mounted behind lower legs the brake power was exceptional, stoppies were no problem on a 480lb tin cover bike, but pad life was short. was due to calipers having no 'trail'.
the hanger wasnt beefy enuff to keep the caliper from swaying side to side under braking. when swayed the caliper/disc misalignment wrenched the pads tight against the disc. hence short pad life and the high stopping power.

when i flipped the calipers to front side of lower legs stopping power was reduced but pad life and lever feed back increased.
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  #12  
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84rzv500r 84rzv500r is offline
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I can measure the 83 XR 1000 rotors tomorrow if needed... i have a 12000 mile original set.... the 1999 XL1200S semi floating OEM rotors work just fine as well. MOCO offers these as replacment/upgrades still... the newer PN requires the hub centeric ring as an additional PN... the plus is that these are SunStar and you can drill out the 11 buttons and replace them with titanium buttons to fully float the rotors... Jingle Jingle
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1999 1200 Sport, SE 7500 ignition, SE air filter, DynoJet , Cone Engineering 2:1 pipe, Storz Steering damper, Russel Mach 3 Stainless Lines, VROD 4 piston front calipers, Bates Baja tires, XR1200 perf shocks, forks and triples coming very soon...

1983 XR-1000S to XR-1000RX Project Build Thread
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  #13  
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three ways to increase brake effectiveness....

2 are expensive and can get complex

1 is very affordable and EASY

1....increase leverage (bigger rotors)

2....increase pressure (redesign system)

3....increase coefficient of friction....(buy a more aggressive pad)

pretty easy decision for me
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  #14  
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84rzv500r 84rzv500r is offline
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Sportster/Buell Model: XLH 1200 S
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Sportster/Buell Year #2: 83
Other Motorcycle Model: RZV500R/R1 hybrid
Other Motorcycle Year: 1984
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Quote:
Originally Posted by mikethebike61 View Post
three ways to increase brake effectiveness....

2 are expensive and can get complex

1 is very affordable and EASY

1....increase leverage (bigger rotors)

2....increase pressure (redesign system)

3....increase coefficient of friction....(buy a more aggressive pad)

pretty easy decision for me
dont forget tire compound and profile where your braking forces are transferred to the ground
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  #15  
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Quote:
Originally Posted by 84rzv500r View Post
dont forget tire compound and profile where your braking forces are transferred to the ground
My post was in reference to your brake system and not tires....the thread is about improving the system....if your pads, rotors, etc are not up to the job your tires won't matter...
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