Disc Rotors...anyone?

[steptoe]

how bad do you want them I suppose is the next ??

[excess.11]

Including Postage......$200.00 a disc ?

[steptoe]

well then, going on that reply, 3 discs for those dollars aren,t out of the relms of affordability 

[Eveready1100]

Just for the record, I got in touch with the seller asking for the discs specs. Here's his reply......

Dear eveready1100,

Hey Mate, These rotors have never been machined. They measure 6.92mm, 6.81mm & 6.80mm with the minimum allowed being 6.0mm & new ones are about 7.0mm. Thanks, Scott


- formulasuper

[Clutch]

looks like you have the answer already. I would agree with xcess and steptoe, don't know how much has been skimmed off. If you are going to pay big $ buy new as eveready suggested.

clutch  aka....Dave

[steptoe]

having slotted discs on mine, {I realise they aren.t drilled} my pads have never shown unusual signs of wear from the sharp edges of the slots,, and the holes are much smaller

I have only 1 concern along the same lines as Jeff,, paying that sort of $$  for discs that may have been shaved a touch to far for our {AUS} standard thickness, a quick question to the fella would allay all fears and quiries tho

[XSIIE]

Thanks folks for all the great advice.

Agreed the "Reco" discs look "pretty" but it makes sense that they have been skimmed and lost some of their meat so may be not so practical.

US$500 is now looking an extremely expensive option considering our $ is sliding south.

Heaps to consider.

Cheers

Eddy

[Eveready1100]

Just for the record, the drilled pair I have on the front of my bike cost $200 shipped to my door from the USA in 2003. They were the original thickness (not skimmed) and looked as new.
 Using the original pads & lines, the difference in wet braking was instantly noticeable without the delay while the pads cut through the layer of water on the disc.
 They do make a buzzing noise under hard application but that's a minor price to pay for the superior control I get in adverse conditions
Since fitting them, I've also updated the rest of the system with braided lines and sintered pads with each new bit improving the feel and power by a lot each time. Makes me think that just the pads & lines alone would improve braking dramatically over the stock system.
Also keep in mind that the original Special brakes are far inferior to the ones on the Standards by a country mile so every improvement on mine is much more significant than might be felt on a more conventional caliper setup.
Another option is that plain discs can be had from the states from about $15 each. T.C. on the dot com site has a template there for downloading so you could drill them out yourself and save a bundle.
OR..........another option would be to spend a little more and get a set of EBC floating discs, which are brand new, much lighter than the originals,and designed to work with these new fandangled pads & stuff and bolt straight on.

[excess.11]

These are nt my words.........they are words of far more experienced people.........just for what it s worth.

QUOTE"Many higher-performance brakes have holes drilled through them. This is known as cross-drilling and was originally done in the 1960s on racing cars. For heat dissipation purposes, cross drilling is still used on some braking components, but is not favored for racing or other hard use as the holes are a source of stress cracks under severe conditions."

QUOTE"On the road, drilled or slotted discs still have a positive effect in wet conditions because the holes or slots prevent a film of water building up between the disc and the pads. Cross-drilled discs may eventually crack at the holes due to metal fatigue. Cross-drilled brakes that are manufactured poorly or subjected to high stresses will crack much sooner and more severely"

Don t shoot me.."Im only the Piano Player".

[Jonesy]

Hey Eddy
I dont see any drama with what Jeff was on about. only the price, I've never searched for discs so dont know what they go for, just seems a bit steep for me

[excess.11]

Here s the thing i see Eddy..........the seller doesn t mention what size(thickness) they have been machined down to!
I also see he has just removed approx 10 % of the usable braking/pad contact area of the disc........just to make them look fancy.

Having drilled holes in discs before....i quickly learnt a rule of thumb experience..........the less disc surface.... the pads have to contact when braking........the less area of friction the pads have to grip and pull you up..........and performance was considerably worse.

In the wet.......most riders , riding style, change... to suit conditions. You generally don t use as much braking pressure as in the dry......due to not being as aggressive and generally being more cautious when brakiing ....for fear of locking up. So there will be some improvements to be had regarding removing water from the disc surface .

For what you may (questionable)gain in supposed more efficient wet weather braking...........he s taken away with surface area.These holes would also wear/tear away the pads a lot faster.



The professionally manufactured disc shown below by Errol..has a far less amount of drilling ...what would seem to be in the order of some 5 %.......the discs advertised have considerably more.

I would also assume they would be noisier to use and more suspect to warpage due to the drilling and machining of unknown proportions.
My standard discs work just fine in the wet and dry.........why fix something thats not broke and also take uncalculated risks at a cost of $500?
Just my opinion.....for what it s worth.

[XSIIE]

Whaddaya reackon? a good deal? or too pricey?

http://www.ebay.com.au/itm/Yamaha-XS1100-Disc-Brake-Rotor-Set-Dual-Fronts-Rear-Cross-Drilled-Excellent-/160806140782?pt=Motorcycles_Parts_Accessories&hash=item2570cafb6e

Look good.

Eddy
78 E
81 G
81 RH x 2