Difference between revisions of "PVD 650B"

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(650B)
(2x9 or 3x9)
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===2x9 or 3x9===
 
===2x9 or 3x9===
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I like 2x9 gearing. It works well enough for all around riding, but makes me hit the pedals a little harder and more efficiently in general.
 +
 +
One real key to doing a nice 2x9 configuraion is by using a 130mm rear hub. Disc versions of these hubs are just starting to become available.
 +
 +
On a 26" bike, I've tended to run a 2x9 with 39-26 up front and an 11-32 cassette in the rear. This translates to a range of developement between 294.1 and 67.4 inches.
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 +
On a 650B bike, this gearing would be corrected to 36-24 up front with the same 11-32 cassette. The development range here would be 284.2 and 65.1 inches, a little wider which may be better and better front shifting. If 284.2 is too low, a 38 tooth ring could be used to increase maximum development to 299.9 inches.
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 +
Now the problem is chainrings. 104mm 4 bolt is the most popular choice for MTB.
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===The Fork===
 
===The Fork===
 
===The Print===
 
===The Print===

Revision as of 15:51, 18 September 2007

650B

A standard 26x2.2" wheel has a diameter of approximately 670mm. A 650B wheel with on of Pacenti's tires has a diameter of approximately 702mm. A 4.7% increase in diameter. A 29x2.2 wheel diameter is about 736mm, a 9.8% increase in diameter. 29" wheels are really to big for all around riding, the 650B may be an improvement. Only testing can say.

2x9 or 3x9

I like 2x9 gearing. It works well enough for all around riding, but makes me hit the pedals a little harder and more efficiently in general.

One real key to doing a nice 2x9 configuraion is by using a 130mm rear hub. Disc versions of these hubs are just starting to become available.

On a 26" bike, I've tended to run a 2x9 with 39-26 up front and an 11-32 cassette in the rear. This translates to a range of developement between 294.1 and 67.4 inches.

On a 650B bike, this gearing would be corrected to 36-24 up front with the same 11-32 cassette. The development range here would be 284.2 and 65.1 inches, a little wider which may be better and better front shifting. If 284.2 is too low, a 38 tooth ring could be used to increase maximum development to 299.9 inches.

Now the problem is chainrings. 104mm 4 bolt is the most popular choice for MTB.

The Fork

The Print

PVD BB