Hello all, Cleaning my rear hub revealed the cracks you see in the picture on the drive side of the hub. I can't see the cracks in the counter bore for the spokes though. Is this something that is seen routinely in these hubs or am I special and this hub is junk? Thanks, Rich
Thanks for the replies Wayne and the offer exsmokingbiker. I am in the US and will source a hub from here. Its strange that those cracks appear in more than half of the spoke holes on that side of the hub. It must be that I have the alpha rotary producing mega HP.
Here's a couple of comments back already. The casting mark idea occurred to me but they look like cracks. The M model RE5s often have what look like nasty cracks in the water pump covers but they really are superficial (look horrible though).
I've just gone down and closely inspected the hub on my GT750 using my reading glasses and a bright flashlight. I have about 5 fine cracks but only on one side of my rear hub (sprocket side). They are very hard to see, you would never notice them (as I have not done) unless specifically looking. How about that ! What Steve says below seems to be the case........more common than we know ?? I'll point out my own finding to these guys and see if anyone else can now find them. May be common and perhaps not really a problem (?)
Hi Wayne, Are they cracks or just casting marks ? John
Wayne, I’ve heard of the problem, but haven’t noticed it in any of my GT hubs….my 750 hub looks OK (at a glance).
I believe it’s more common in racing circles, but it may be more common than we realize, possibly a result of overheating from heavy use or a dragging brake show (my two cents worth anyway….) Steve.
Just heard back from John again who's racing goes back to the late '60's and early '70's for Suzuki. He says that other than a T20 that had a hub failure mid race, he's never heard of another Suzuki of that era having a hub fail. He also sold them into the mid '70's so I'd guess he'd have heard. If the cracks are real, it may be common and they may be superficial.
Hi all, Mystery solved. I took a look at the cracks again on both hubs but this time with 10x power. They do seem to be casting flaws and in fact occurred on the same holes to the same degree more or less. I then took 120 grit sand paper on a block of wood and was able to sand them out on the original hub in about a little less than an hours time.