Jump to content

Recommended Posts

Posted

Well I stumbled upon these on Ebay.......wish I could afford them.

but I'm not really sure they are the right dimensions,( 300x 5mm ) just putting it out there if anyone was lookin for a cheaper alternative.... anyone know if these are correct fit?

 

http://www.ebay.com/itm/Full-Set-Brake-Disc-Rotor-Yamaha-XVZ-1200-VENTURE-84-87-/260782643977?hash=item3cb7db5b09&item=260782643977&pt=Motorcycles_Parts_Accessories&vxp=mtr

 

I think they're off on the yrs, but I'm still learning here

Posted

Nice looking rotors and you are correct about the year being off, these will only work on 83-85.

 

A couple of issues I have with the 'Wave' style rotors is the reduced pad contact area. The waves come into the pad area, thus reducing the square inch area the pads are contacting on the rotors. Especially when coupled with the slot that is cut internally on the pad area. Other thing that might be an issue, maybe not, is the leading edge of the cutouts may cut into the pad ever so slightly every time they cross pad on each rotation with brakes applied, thus reducing pad life.

 

Gary

Posted
I am hoping I can get another year outta my rotors on the 85, I should probably be looking at these, but am finding the price a bit steep.

Brian

 

The ebay ones ($126/pair) are about half the price of EBC replacements:

http://www.ufo-productions.com/Brake-Pads-Shoes-Rotors/EBC-BRAKES-MD2096.html $157ea

[ame=http://www.amazon.com/EBC-Pro-Lite-Brake-Rotor-MD2096/dp/B0045L96UK]Amazon.com: EBC Pro-Lite Brake Rotor - Front/Left MD2096: Automotive@@AMEPARAM@@http://ecx.images-amazon.com/images/I/31TKBWai3sL.@@AMEPARAM@@31TKBWai3sL[/ame] $132ea

Posted
I am hoping I can get another year outta my rotors on the 85, I should probably be looking at these, but am finding the price a bit steep.

 

Brian

 

Steep?

You have not priced OEM rotors yet. around $300 EA.

 

I am thinking of getting a set just to put on the shelf for someday when I need them.

I just wish they had a rear disc also.

Posted
Steep?

You have not priced OEM rotors yet. around $300 EA.

 

I am thinking of getting a set just to put on the shelf for someday when I need them.

I just wish they had a rear disc also.

 

Yeah, i have priced them.:mo money: but they arent available for a 83-85 anymore.( or did I miss something...?) I was thinking that my budget was gonna be in the used range.

 

Brian

Posted

A couple of issues I have with the 'Wave' style rotors is the reduced pad contact area. The waves come into the pad area, thus reducing the square inch area the pads are contacting on the rotors. Especially when coupled with the slot that is cut internally on the pad area. Other thing that might be an issue, maybe not, is the leading edge of the cutouts may cut into the pad ever so slightly every time they cross pad on each rotation with brakes applied, thus reducing pad life.

 

Gary

Well I'm no expert by any means, but it was my understanding that "wave" rotors were the "HOT" set up for ricerockets and even the newer MX bikes.... and these are $96 each including shipping!!! I've read here something about the 5mm would be better??? but that was on the R1 upgrade for MKII's... it's all outta my budget until work picks up....oh well tomorrow is another day. LOL

I just hope this helps somebody that needs 'em

Posted
Well I'm no expert by any means, but it was my understanding that "wave" rotors were the "HOT" set up for ricerockets and even the newer MX bikes.... and these are $96 each including shipping!!! I've read here something about the 5mm would be better??? but that was on the R1 upgrade for MKII's... it's all outta my budget until work picks up....oh well tomorrow is another day. LOL

I just hope this helps somebody that needs 'em

 

The big difference is that MX and rice rockets are not trying to stop 1500 lbs.

My Venture fully loaded, with my fat but on it, pulling my trailer will easily hit 1500+ lbs.

I want all of the stopping power I can get. All of the slots and waves are reducing the effective area of the brake pads.

Posted

Yes It sounds like I never considered how light those bike are... one of these days I'll stop buying things based on cool factor:confused24::rotf::rotf:....LOL

Posted

Below is a link to a set that will work for my radial brake project & the 1st gen MKI's that are a little more to my liking.

 

http://www.ebay.com/itm/140639501742?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649

 

They still have the cross drilled holes, which may be very helpful with these narrower rotors to dissipate heat.

 

The 5mm rotors will tend to heat up more than the stock 8.5mm width rotors. The same amount of clamping force/friction will be required to stop a given bike with either width rotor. The 8.5mm rotors will have more mass to adsorb the heat generated by the friction and dissipate it without warping.

 

Another consideration that needs to be considered is that a 5mm rotor is 3.5mm (.1377") narrower than a stock 8.5mm rotor. The inner face of the 5mm rotor will be in the same plane as the stock 8.5mm rotor up against the rim face. The outer face will be offset the 3.5mm. This will cause the outer piston on the rotor to be pushed out of the caliper body by the 3.5mm. This is quite a bit and may cause the piston to pass the sealing point of the caliper seal. A solution would be to shim between the caliper body and the fork mount ears by 1.75mm (.0688") or half the offset amount. A 1/16" stainless washer with an O.D. matching the contact area would accomplish this.

 

Gary

Posted

Wave rotors stop faster because the edge of the wave catches the pad. Yes the pads wear faster, but you also stop faster. Same with drilled rotors. The edges of the holes catch the pad allowing for a faster deceleration. Wave rotors are also good to keep the pads clean. Debris and dust can't be caught between the pad and rotor.

Posted
Wave rotors stop faster because the edge of the wave catches the pad. Yes the pads wear faster, but you also stop faster. Same with drilled rotors. The edges of the holes catch the pad allowing for a faster deceleration. Wave rotors are also good to keep the pads clean. Debris and dust can't be caught between the pad and rotor.

 

It was my understanding that the reason for drilled/slotted/wave rotors was to allow for the escape of gases generated when heavy braking superheats the pad material, causing off gassing.

Posted

http://www.motorcyclistonline.com/howto/122_0511_wave_motorcycle_brakes/index.html

 

"When a brake pad finds a brand-new leading edge or a brand-new surface every time, it has better brake-lever feel. It initiates new bite, y'know? So basically that's the whole idea.

 

 

"The wave shape adds leading edge to the contact between the pad and the rotor. That's very good. So as it rotates, the depth of the cut of the wave is what we believe gives the brake system its feel."

 

they found a consistent 20-degree drop in rotor temperature--pretty significant for what is usually a fairly small and overworked part to begin with. So, wave rotors also dissipate heat better than round discs

 

So they stop better and stay cooler under heavy braking.

Posted
It was my understanding that the reason for drilled/slotted/wave rotors was to allow for the escape of gases generated when heavy braking superheats the pad material, causing off gassing.

 

You are correct, also useful in motocross to clean pads.

 

For the somewhat sane riding we do though, I think lowered contact area hurts the performance more than the other benefits help.

 

Somewhat interesting web site linked.

 

http://fsae.com/eve/forums/a/tpc/f/125607348/m/20710854521

 

Gary

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
×
×
  • Create New...