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Bicycle Repair/Converting 7 gear to 9 gear

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Question
I currently have a 3X7 speed road bike. Could I replace my 7 speed cassette with a 9 speed cassette and get 9 speed shifters to convert to 3X9 setup?  Can I keep the current derailers?

Answer
As long as you maintain the same make of shifters, etc, you could probably reuse your existing derailers. However, 9 speed cassettes require a 9 speed freehub, which is slightly wider/longer than your 7 speed version; this is going to require a new hub, or rear wheel. The 9 speed system will also require the requisite, narrower 9 speed chain.

Bicycle Repair

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James Novak

Expertise

I can answer most inquiries with respect to bicycle assembly, repair, tuning and maintenance. I am less than inclined to speak on such questions as "What kind of bike should I buy?", &/or "What is this bike worth?", etc. Any answers to these types of questions may correlate poorly to an acceptable "fact/sarcasm" ratio.

Experience

7 seasons of "Professional" bicycle service/repair, etc. 4 seasons as Instructor, Professional Bicycle Mechanic training college. n-1 seasons of riding, cracking, crushing, mutilating and breaking bikes of any & all varieties, and thus requiring intense and at-hand skills development, etc.

Education/Credentials
Certified Professional Bicycle Mechanic; Winterborne Bicycle Institute/Conestoga College

Past/Present Clients
The Hub Bicycle Shop, Hespeler Winterborne Bicycle Institute

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