martslc

On my Shimano 7900 C50 clinchers I'm using “Kool Stop” brake pads but they are wearing fast. It’s much cheaper buying pads so I’m looking for a really soft, good working pad to extend the life of the rims. Any thoughts or some good, soft pads??

Thanks!

gsa103

Shimano pads? The newer ones seem relatively soft.

AristoNYC

is the braking surface carbon or alloy? if its alloy, then just grab any cheap pads (kool-stop work the best). If carbon then make sure you use a carbon specific pad (swiss stop black prince, or BBB BBS-25).

martslc

Shimano 7900 C50 alum clinchers. (Rim wear hole indicator)

(First)
(It could be worn off but looking to confirm there is such a hole on older C50 clinchers here on the forum first.). The manual says: "The hollow on the opposite side to the valve hole is an indicator for the amount of rim wear." Please explain in (layman terms) where this indicator is suppose to be???? I'm lost and not seeing any such drill hole.

(Second)
I have a micrometer, does anyone know the minimum wall thickness on the rim wall on "7900 C50" rims???

Thanks a ton!!

milkbaby

^That is the typical look of a rim wear indicator. Just a little divot/hole in the rim. Look for it on the opposite side of the wheel from where the inner tube valve sticks out according to the manual. But if it's not the right manual, just look all over the rim for it on both sides, I'm pretty sure Shimano will have one on their aluminum rims.

I don't know the recommended wall thickness, but you can take the tires off and put a perfectly flat straightedge on the rim in the same direction as the spokes and see if there is substantial scalloping. You can also feel it with your fingers.

Unless you're riding in the rain and/or snow all the time, rims should last a decently long time. I bet it's probably similar to or at least half of what you should get out of chainrings?

rmfnla

You don't say which color Kool Stops you use.

The salmons are significantly softer than the black ones...

TrojanHorse

The kool stops are wearing fast or the rims are?

martslc

Many here say the blacks are softer but I emailed Kool Stops and was told black is softer and less aggressive on rims the salmon's.

Go figure.

martslc

Sorry..... the rims.

martslc

Yes I have learn a pricey lesson. I got caught in a bad rain storm out in a desert area and the road was covered in sandy water. I was extremely cautious and kept my speed way down on the descents as I had wrecked recently and didn’t want that to happen. All I can figure is that did it, took off what life I had left on them. They are 5 years old but have allot of miles on them. I can see what looks like a blemish where the hole us to be on the rims now. Thanks.

Silvercivic27

Well, on the bright side, the C50 9000s are on clearance now to make way for the new C40 and C60s, so you should be able to get a smokin deal on a new set of wheels!

https://www.excelsports.com/main.asp?...jor=13&minor=1

rmfnla

??

martslc

Oops, they said the salmon's are harder and more aggressive on rims

rmfnla

Got it.

Surprising, though. I use blacks but I put the dual-compound on my wife's bike and I was sure the salmon part was softer.

Oh well, live and learn...

Thanks!