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Drilling Elongated Holes in GS1100 rotors

posplayr

posplayr

Forum LongTimer
Past Site Supporter
TGSR Superstar
My (83) GS1100ED and (81) GS750EX both have the same rotors and I'm planning on sending in a set to have them surface milled. The shop also provides drilling services, but since my rotors have an elongated drill hole pattern already, I wondering if it is worth the effort or expense to either a.) increase the number of elongated holes
b.) Drill more round holes
c.) Leave well enough alone.
d.) Add slots between the existing holes?

This is for a Street bike and not a road racer and no plans for track days. If I really need a big step up in performance I will g owith the GSXR front end.
Having said all that, I understand this really improves things. I'm going to be into $40 per rotor for surfacing anyway, probbaly another $50 for drilling/elongating holes.......

Comments 8-[
 
posplayr said:
My (83) GS1100ED and (81) GS750EX both have the same rotors and I'm planning on sending in a set to have them surface milled. The shop also provides drilling services, but since my rotors have an elongated drill hole pattern already, I wondering if it is worth the effort or expense to either a.) increase the number of elongated holes
b.) Drill more round holes
c.) Leave well enough alone.
d.) Add slots between the existing holes?

This is for a Street bike and not a road racer and no plans for track days. If I really need a big step up in performance I will g owith the GSXR front end.
Having said all that, I understand this really improves things. I'm going to be into $40 per rotor for surfacing anyway, probbaly another $50 for drilling/elongating holes.......

Comments 8-[
Click to expand...

Not worth it, IMHO.
Having seen quite a few SETS of rotors (near-new condition) sold on ebay for less than the $40.00 quoted price to surface-grind a single rotor, I would be more inclined to simply replace them, and go with option 'C' from the list.:)
Then I would use the $$ saved, on some sweet HEL SS braided lines. ;)

Tony.
 
Last edited:
posplayr said:
a.) increase the number of elongated holes
b.) Drill more round holes
c.) Leave well enough alone.
d.) Add slots between the existing holes?
Click to expand...
Option 'c' for me. As you said it's for a street bike. Spend your money on some chrome, new tin of paint, braided lines etc.

If you were trying to lose excess heat, shave off as much weight as possible (etc.) I'd consider it, but otherwise you are just making someone else wealthy.
 
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