|Textured rims||Eager Beagle|
Dec 10, 2002 7:55 AM
|I used to have a rear winter rim, with a cris-cross pattern machined into the breaking surface to aid stopping. I can't remember what make they were - may have been weinmann.
Any one know if you can still get these? Until discs get in, I could really use one at this time of year.
|Was it steel or aluminum? Anyway, in theory...||Silverback|
Dec 10, 2002 8:40 AM
|Only patterned rims I've ever seen have been steel, which works less effectively than aluminum even with the crisscross--they had to put the pattern in for wet weather, because the things wouldn't stop at all if they were damp.
In any case, at least in theory, the pattern just takes material out of the friction surface, so it increases stopping distance. Probably doesn't hold true if you're in conditions in which the channels direct water away from the pads, but before I spent a lot of time hunting for those rims, I'd try a swap to a good aftermarket brake pad.
|Steel I think||Eager Beagle|
Dec 10, 2002 8:45 AM
|we are talking 15 years ago here.
I didn't paint a very clear picture - the pattern was raised, rather than machined into the rim, hence the better friction.
I have been through all the pads around - the bottom line is that my commuter (for which I want them) drips with oil/diesel off the roads at this time of year, and with that, no pad's got much of a chance, rubber on smooth metal.
They really did help the stopping - I suspect you would need some harder compound pads though, or you'd get through them pretty fast.
|re: Textured rims||Spunout|
Dec 10, 2002 11:21 AM
|Yup, for chromed steel rims. But, with Aluminum rims the stopping power is sooo much better, never go back there! Probably even moreso in the wet.
Remember those dotted chrome steel braking surfaces and whimpy centre-pull brakes? Couldn't stop those 28lb monsters on a downhill to save your life!
|re: Textured rims||JimP|
Dec 10, 2002 11:44 AM
|I have a pair of Nimble carbon fibre rims that have a slight texture in the fibre. These will slow you down quickly, wet or dry. They also will eat through brake pads.
|Rigida, among others||Kerry|
Dec 10, 2002 4:31 PM
|Look at it this way - texturing a steel rim doesn't help braking when it's wet because it's so bad you couldn't tell if it improved by 25%. Texturing Al rims would be pointless as the braking action would smooth out the texturing very fast, particularly on a commuter that is ridden in the rain. So, there's no point in texturing, and that's why you don't see this on any current metal rim.|
|Tks all||Eager Beagle|
Dec 11, 2002 1:10 AM
|Looks like carbon it is then. Trust me, I'll take 25% where I can find it!|
|A little bit of history||jhr|
Dec 11, 2002 8:54 AM
|When I was a young racer dude in the mid 1980's a buddy of mine and I stumbled upon a mother load of silver Mavic tubular rims with a waffle type pattern on the braking surface (I am pretty sure the waffling was stamped on). The rims were aluminum. These rims had no eyelets and were pinned but not welded. They were on the shops blowout table for $5.00 each. We bought all the shop had appr. 10 rims. Judging by the decals and dust they had to be at least 10 years old when we bought them.
We built them up as training wheels. I remember I had a set built up with Mallard High flange hubs (also 10 years old in the mid 80's), with a suntour 6 sp freewheel and a big heavy Panaracer or National nylon tubular training tire.
I don't rember that they improved braking performance (in the rain or otherwise), what I do rembember is that brake pad rubber or dust built up in the waffle holes and was impossible to get out. Otherwise the rims were unremarkable except for the fact we got them so cheap.
I suspect we don't see them anymore because they didn't really work any better than regular rims.
Thanks for allowing me to recall a pleasant memory from the old days (pre-SIS).
|I don't remember a lot from the '70s ...||the other Tim|
Dec 11, 2002 4:59 PM
|but I remember having some sew-up rims with radial serrations along the braking surface about 1-2mm apart. They were Al, and don't think they had eyelets. I can't remember who made them. I don't know if they improved braking performance, but I did go through pads a lot faster in those days.
Ahhh, the old days; every shifter had infinite trim.
|what about ceramic coated rims||laffeaux|
Dec 11, 2002 1:07 PM
|I've never used them on teh road, but I have a set on my MTB. They provide a bit more stopping power than regular machined rims.|
|Stop better, cost more, eat brake pads (nm)||Kerry|
Dec 11, 2002 4:25 PM
|No dics||Eager Beagle|
Dec 12, 2002 1:43 AM
|Using ceramic OPs at the moment - no good.
As I said above, it's the oil/diesel on the road that's the problem, and washing it off a commuter every day isn't a viable option for me.
Unless someone knows some brake pads I am unfamiliar with, I can't see how any "simple friction standard set-up" is going to work effectively in that situation. I can see how pads with abrasive stuff in would, but by trashing the rim. So as far as I can see, short of discs, the only way is to have the abrasion on the rims, and sacrifice a couple of sets of pads while the weather is so bad - good exchange for no kissing the backs and sides of cars on the way in/out of work!
Any better thoughts/reasoning than mine?
|"dice" even. Is it holiday time yet - I need a rest. nm||Eager Beagle|
Dec 12, 2002 1:47 AM