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Hey Campy wheel experts, answer this Nucleon quest. for me!(13 posts)

Hey Campy wheel experts, answer this Nucleon quest. for me!Alpine
May 16, 2001 11:25 PM
OK, Nucleons can be had in Campy 9/10 compatible or Shimano 8/9 compatible.
I'm building a Klein Quantum Race with Chorus 10 but have a 16 pound Kestrel 200EMS with Dura Ace 9 that I'd love to try the Nucleons with. The Kestrel is that light with the standard 32 hole Wheelsmith built wheels. The Nucleons should make the bike an unreal climber.
Are the wheels easily switchable between Campy and Shimano compatible? Can I do it myself if they are switchable? I'd only be doing this conversion once or twice a year.
only if you're desperate, I thinklonefrontranger
May 17, 2001 7:24 AM
The quick and unscientific answer is not exactly. My teammates and I did some "field research" on this one. Last year we went to a crit where something on the course caused many, many punctures. None of us had spares, so since the junior guy and I both raced together, then he turned around and did the 3 race with my boyfriend, we wound up switching wheels back and forth. My bike = Ultegra 9. Junior's bike = DA 9. Boyfriend's bike = Record 10. Our junior rear flatted right on the start line (don't you hate that?) and took the C-10 from my boy - it "sorta worked", well enough for us to establish a break together and win our respective cats, but there were only a couple usable gears (he was grinding a lot and I had to make him sit on going up the small climb every lap so he wouldn't crash me). Then in the 3 race, my boyfriend also rear flatted, and put my Ultegra 9 wheel on, and said it worked ok, but not great (10-speed chain is thinner, no?). He was able to get workable gears enough to contest the sprint, but he said he wouldn't do it again by choice.

I don't know if the hub spacing is different, so maybe it's something where you can change cassette bodies back and forth. Someone else has a much more scientific answer I'm sure.
I'm just talking a cassette body swap...Alpine
May 17, 2001 4:44 PM
I know it will take changing the cassette body but don't think it would be difficult. I'd like to hear from someone that has pulled their's off for servicing or repair to find out if special tools are needed.
Won't make an "unreal climber"...dave
May 17, 2001 3:33 PM
Obviously you have to change the cassette body if you want to use a properly spaced shimano cassette. It sounds like a lot of trouble and expense to me. Campy could tell you if the cassette bodies are interchangeable.

As an engineer, who has a reasonable understanding of physics, I can guarantee that you won't be able to feel the difference in climbing ability. Sure, it will improve, but less than one percent; certainly nothing noticeable. A set of Nucleons are only about 150 grams lighter than a set of 32H open pros with DuraAce hubs.
May 17, 2001 4:39 PM
I'm not sure where you are getting the basis for your statements. I happen to have a engineer related degree also and my job demands understanding of such things but all that aside...
When I pulled the 32 hole Mavic rimmed, Chorus hubbed wheels off my last bike and put the Heliums on it I certainly felt the difference in climbing ease. Climbing is something I do quite a lot of too.
Also Nucleons weigh about the same as Heliums at around 1,650g a wheelset. Most standard 32h Wheelsmith built wheels weigh at or over 2,000g a pair. When I get the chance I'll pull the tires, tubes and cassette off the Kestrel wheels and find out exactly what the difference in weight will be.
did you skip physics?...dave
May 18, 2001 1:45 PM
Why go to all that trouble, when all the part weights are readily available?

A set of 32H open pros with DuraAce hubs and 14/15 spokes weighs about 1830 grams, complete with skewers. If the Nucleons are 180 grams lighter, this is .4 pounds. If you weigh 160lbs and your bike weighs 16lbs, this is a weight reduction 0.2%. If you're climbing at a steady 15mph, you could expect an improvment around
.03mph, from the weight reduction.
No, what I did skip was...Alpine
May 18, 2001 7:50 PM
What I didn't get in all my years of college was the course that makes me assume that I know more about someone's situation than I do. Like, assuming that my DuraAce wheels were built with Open Pros and only weigh about 1830 grams. They weren't and a lot of the weight reduction will be in the rim and spokes. I don't need to start making calculations to know that there will be a discernible difference in the work it will take to spin up and maintain rpms on a wheel with a lighter rotational weight. You could also calculate how much effort would be saved over a total climb of say, eight miles at x% grade. I suppose I won't be able to feel that either.
If these wheels are different enough to make a difference then why did every pro team start using versions of "slightly" lighter weight wheels as soon (before most of us knew about them) as they became available?
Cassette spacersJonathan Zook
May 17, 2001 6:22 PM
Wheels Manufacturing makes different width spacers to go between the cogs of a cassette to change the spacing. So you can take one cog off your campy cluster, replace the spacers with the slightly wider Shimano ones, and voila, you have Shimano 9 speed. No need to change out the cassette body. A good thing, because you really don't want to deal with the 100 or so bearings found inside!! You can get these at Branford Bike ( Good luck
So a Shimano cassette will slide onto a Campy hub?????Alpine
May 17, 2001 7:03 PM
Doesn't seem like that's the case. I didn't think the cassettes were cut to the same shapes where they meet the cassette body.
Use the CassetteJonathan Zook
May 18, 2001 10:45 AM
You'll use the campy cassette, but with the shimano width spacers. This will allow you to use the wheels on the Shimano 9 equipped bike.
Use the Campy Cassette (addition)Jonathan Zook
May 18, 2001 10:55 AM

I may have led you to he wrong location on the web page. Check this one out.
you're confused...dave
May 18, 2001 1:53 PM
You can't respace a campy 10 speed cassette to shimano 9 speed, since most of the cogs are riveted together, in groups, attached to a carrier.

You could respace an older 9 speed campy cassette with loose cogs to shimano spacing, though, and this might be the best option.

Obviously, you've never removed a campy cassette body.
If you can buy the Nucleons with a Shimano-compatible hub,bill
May 18, 2001 12:59 PM
you then will need two cassettes. Both will have to be Shimano-compatible as to the hub (campy and shimano have entirely incompatible hubs), but you'll need different spacing. I suppose it is possible to buy one set of cogs with changeable spacers (I think such products are out there), one for Shimano and one for Campy, but my point that does not seem to be covered in other posts is that you first need to match the hub and the cassette and then to match the cassette and the drivetrain. I don't believe I've heard of conversion cassettes that use campy-compatible hub to Shimano spacing. I don't know why they wouldn't, but I've never heard of it.
I've heard that Campy nine shifting works with Shimano nine cassettes, and vice versa, and 10 sp. is convertible to nine sp., but who needs that?