Bike technical question regarding wheels and hubs

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ctbrian

2011-11-15 12:02 PM

Veteran

362

Subject: Bike technical question regarding wheels and hubs

I currently have a 9 speed cannondale. looking to upgrade the wheetset on this. maybe mavic kysrium. looking on ebay for something used. i know i have to make sure that the hub is shimano but do i need to worry about if it is 9 or 10 speed?

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Tom Demerly.

2011-11-15 12:16 PM

in reply to: #3902909

Elite

3498

Laguna Beach

Subject: RE: Bike technical question regarding wheels and hubs

The key concerns are:

1. Spline pattern of the cogset you want to use compared to the freehub body you want to buy: They must match.

2. Spacing of cogs: They must be in the precise proximity to one another for the shifters to position the chain correctly on the cogs.

The shifters only know how to put the chain in 9 specific places. The cogs have to be there.

In general 8,9 and 10 speed us a 130 millimeter overlock dimension, so that isn't an issue.

Here is the problem: The distance from the center of a 9 speed cog to the 9 speed cog next to it needs to be precisely 4.34 millimeters. On a 10 speed cogset it needs to be 3.95 millimeters.

Now, when you put this together on the bike there is also an issue with chains, and some chains are more forgiving with marginal compatibility than others.

Bottom line: You need a good mechanic.

briderdt

2011-11-15 12:22 PM

in reply to: #3902909

Champion

10668

Tacoma, Washington

Subject: RE: Bike technical question regarding wheels and hubs

The freehub is the same for 9- and 10-speed. The difference is in the cogset. You can swap your 9-speed cassette onto a 10-speed freehub and ride away with likely nothing more than a little twist of the cable tensioning barrel to dial in the shifting.

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graceful_dave

2011-11-15 10:24 PM

in reply to: #3902931

Champion

4835

Eat Cheese or Die

Subject: RE: Bike technical question regarding wheels and hubs

Tom Demerly. - 2011-11-15 12:16 PM

The key concerns are:

1. Spline pattern of the cogset you want to use compared to the freehub body you want to buy: They must match.

2. Spacing of cogs: They must be in the precise proximity to one another for the shifters to position the chain correctly on the cogs.

The shifters only know how to put the chain in 9 specific places. The cogs have to be there.

In general 8,9 and 10 speed us a 130 millimeter overlock dimension, so that isn't an issue.

Here is the problem: The distance from the center of a 9 speed cog to the 9 speed cog next to it needs to be precisely 4.34 millimeters. On a 10 speed cogset it needs to be 3.95 millimeters.

Now, when you put this together on the bike there is also an issue with chains, and some chains are more forgiving with marginal compatibility than others.

Bottom line: You need a good mechanic.

Really? I don't actually see an answer to the OP's question among all those words, but I may have missed it. I spaced out around "percise proximity." You may be the most prolific writer in the industry, but it's not helpful to answer a simple question with so much irrelevant, overly detailed information.

To the OP:

9 and 10 speed cassettes will both fit on the Mavic Ksyrium hubs so long as you get the Shimano version, not the campy version. So, you should be able to pick up a wheel and use your existing cassette. To be sure, you can always take your bike to a shop and have them help you get the correct wheel for your application.

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syjenkins

2011-11-15 10:44 PM

in reply to: #3903693

Member

215

The Heeb, UT

Subject: RE: Bike technical question regarding wheels and hubs

graceful_dave - 2011-11-15 9:24 PM

To the OP: 9 and 10 speed cassettes will both fit on the Mavic Ksyrium hubs so long as you get the Shimano version, not the campy version. So, you should be able to pick up a wheel and use your existing cassette. To be sure, you can always take your bike to a shop and have them help you get the correct wheel for your application.

Very True - the one area you need to look out for is a custom wheel built with a 7800 series Dura Ace hub and/or the pre-built 7801 wheels, as these use deep spline freehub bodies which are 10 speed only.

One thing to consider in the aero conscious world of tri - Ksyriums (at least the ones with the zycral spokes), while great training and decent climbing hoops are some of the least aero wheels available. Don't hesitate to consider some of the other options out there that are available for the same $$

And to graceful_dave - a buddy of mine from high school (he goes by Christian nowadays) rides/races with your shop team. Small world!

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JeffY

2011-11-16 3:06 PM

in reply to: #3902909