Brake rotor carrier questions

[Morizzi]

I'm with Cam and Simon. Many A2 and A4 stainless are not much stronger than grade 1. A lot depends on the torque chart used. Many I've seen give A2-70 as  typical of 700 but a minimum of 500. That's a big variance. 

At times like this I ask myself 'whats to gain and what's to lose?'  :

Stainless isn't significantly lighter but its weaker and shiny. 8.8 isn't shiny but its stronger for similar weight. When I'm trying to brake really hard and wash off 50kmh do I care more if they are shiny or strong? This is why I'm on the No side.

Because I like to stand on the pegs to stretch my legs I only use 8.8 for those bolts too. Stainless is out.

You need to be careful using stainless into alloy too. It is more noble than steel so the difference between it and alloy in nobility is greater, hence greater risk of electrolysis. Not saying it can't be done, just saying you need to be careful. If you don't understand the difference between active and passive stainless or what compounds can be used to insulate the 2 types of metals then google is your friend. I stongly recommend you DO NOT use nickel or copper antiseize.

I'm more paranoid than most on this as I work in the Marine industry on alloy boats. Steel shafts, alloy hulls, brass propellors, all in salt water. They are little current factories. They are welding themselves together even as I sleep. 

Cheers

Rod

 

[markQLD]

When Piero handed the kit over ........... and wagged a finger at me saying "make sure you use these bolts, don't use inox [Italian generic for stainless, from the French term acier inoxydable]"

reckon Piero might have been thinking about the 'fatigue' performance ??
i've seen stainless bolts let go on machinery with no warning.  have been doing the job for years, no problem, and then 'bang', completely sheared off.
having said that, i do use a lot of stainless,, but i'm with Rod.  i would never use stainless to bolt on a foot peg.  never.  crazy idea.

 

[Davo]

Perhaps an early entry for DHOTY here. So the new EBC floaters arrive and I bolt them on the wheels. Rear wheel no probs all bolts in and tensioned perfectly at 33ftlb

Front wheel is a different story, most of the the bolts doing up to tension but one bolt reused and just spun. Fuck, thread must be rooted so start investigating Helicoil kits. As all the nice new stainless bolts were still in the wheel I pulled out the carefully marked plastic bag with the rusty originals. Bugger me, there are 2 different lengths of bolts, 12 of 30mm and 6 of 25mm. All my bright shiny new bolts are .... 25mm. Pulled out the loose bolt and whacked in the rusty old 30mm bolt and hey ho up and tight to correct tension.

All had previously done up to full tension with the original Brembo carriers so perhaps the EBC carrier is a touch thicker. Either way, had I not returned the Metal Gear rotors I would have been happily riding around with about 3 threads depth holding the front rotors on, until the first emergency stop. Doesn't bear thinking about.

New 30mm bolts on order.