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various open pros(8 posts)

various open proscollinsc
Jan 6, 2002 8:28 PM
so i see that there are 3 types of open pros
the regular ones (425g) the CD ones (440g) and the CD/Ceramic ones (460g)

Mavic talks about improved hardness and braking efficiency, is it bunk or does it work? is the difference in weights significant? are the weights out weighed (heh) by the other benefits?

open pro owners, what do you have and what do you think?

thanks,
chad
re: various open prosI Love Shimano
Jan 6, 2002 9:40 PM
Since everyone is asleep at this time, let me have a go. From what I've heard and read, the ceramics really do have superior braking, especially in wet conditions. However, I think it is a good 100(?) grams heavier than the regular open pros. I don't know how much that would affect acceleration though.
I have the standard Open Pros.nigel
Jan 6, 2002 9:44 PM
I haven't ridden much in the rain in the past year since I've gotten them, but will be this year on forward since I'll be training and racing. The difference is alleged to relate to wet-weather braking distances.

While I'm as much of a weight weenie as the next guy/gal, I'd say the 35 grams per wheel would be worth it for extra control in wet conditions, particularly in race situations.

To put it into perspective, 35 grams equals .07% of a pound (453 grams equals one pound): hardly worth worrying about.

I hope this helps,
Nige
Mathematical correction.nigel
Jan 6, 2002 9:48 PM
35 grams equals 7% of a pound, not .07% as previously stated.

I'd consider the Ceramics. I heard something about the brake pads either being expensive or that they wear out quickly. You may want to check into this--or ask the people on the board about their experiences.

Cheers,
Nige
CeramicsRay Sachs
Jan 7, 2002 5:14 AM
I have a ceramic OP on the front of my bad-weather / commuting bike. It eats through brake pads faster than a hot knife through butter. Not quite as bad on ceramic specific pads, but still very fast. There is very little difference between dry and wet weather braking, so they are very effective for braking in the wet. If I had it to do over, I probably wouldn't have gone with ceramic but, as noted earlier, if you ride in the wet a lot in a hilly area and don't mind changing the blocks a lot, they're not a bad idea.

-Ray
Depends where you ride.cyclequip
Jan 7, 2002 4:06 AM
The CD's are much harder than the normal OP's, the Ceramics useful if you live in a wet, mountainous area, the normal rims perfect for everyday riding. The weights are not an issue AT ALL - unless you are racing seriously or need the braking benefits, stick to the normal rim.
Mavic experienceNessism
Jan 7, 2002 6:23 AM
Most of my experience is with the older Reflex clincher rim which is very similar to the Open Pros.

Standard rim w/machined sidewall offers very good braking performance for general purpose riding.

CD style rim has coating on top of machined sidewall. The coating is hard and slippery and decreases braking performance. After a while the coating will start to wear through resulting in wear spots showing in the sidewalls. The wear is only significant from a visual standpoint.

Ceramic rims eat brake pads like no tomorrow. Maybe some aftermarket pads would be better but standard Shimano pads will disappear in short order. Also, if a stone flys up and chips the ceramic coating you will have rough spot that will feel similar to a rim with a poor rim joint.

Good luck.
ceramic coating for wet brakingDog
Jan 7, 2002 6:32 AM
Ceramic coated rims are vastly superior in wet braking. Yes, they eat regular pads, but then regular pads always wear fast when wet, too (ever have black gunk dripping off your rims after riding in the rain?). Get some ceramic designed brake pads, then you'll be ok.

I had ceramic rims on my mountain bike, and I could plow through 6" puddles and brake completely normally. Pad wear was acceptable with ceramic designed pads.

Dog