Road Cycling - new cassette

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View Full Version : new cassette


lin_kieu
04-19-02, 11:05 PM
Hi. I hope I'm posting this in the right category. I've got a Trek hardtail and don't do too much MTBing in the summer. Most of my riding during the warm months is done on the road. However due to other financial responsibilities at the time, I can't afford to buy a proper road bike :( Anyway, I've put on thinner, slick tires to speed up. Also, I had been told and read numerous times that I should replace my MTB gears with a road cassette so I can get more usable gears. I did so today, and must admit they were right. But now all the gears seem so much harder to push. I have 3 chainrings, and never used the "granny gear" - until today.
Has anyone else done the replacement I did? All of a sudden I feel weak and out of shape. I rode pretty fast with a high cadence (90 to 110) in the middle ring with my old cassette. Now I have to drop down to the smallest ring to achieve the same cadence. Can someone explain this to me?


ljbike
04-19-02, 11:23 PM
Welcome to the Forums. I don't have an answer for you, but I do have questions: what gearing did you get on the new cassette? Normal road gearing would be 12/25 or 12/27 or 12/28. And the other question is: what gearing do you have on your chainrings?

Actually, I just thought of a third question: what gearing was your old cassette?

MichaelW
04-20-02, 06:53 AM
You should chose your gear range and ratios according to your own strength and style and the terrian and load you carry.

MTB gearing is quite low, so riders on the road can spin out going down hills, and there is usually no need for a very small granny, unless you are touring with a big load.

Gears are usually measured in gear-inches.
No of teeth in chainring
---------------------------- x diameter of wheel
No of teeth in rear cog

The same gear-size would feel identical no matter what tooth combination you used to produce it.
My every day road bike has a range from 28 to 103.
A standard road double would go from maybe 42 to 134, which for me would be way too high.


jmlee
04-20-02, 07:25 AM
I have created a set of Excel worksheets which allow you to enter your gearing, wheel circumference, and desired cadences. With them, you may compare various gearings and your speed in a given gear/cadence. This may help you analyze your preferences. You may download them (free) at www.uni-bonn.de/~jmlee.

Cheers,
Jamie