Mountain bike
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Want to know what size cranks i need for my spalding mountain bike?



it is an 18 speed spalding dynosport and is about 8? years old

It depends on the model. Spalding was a low end bike sold mostly at places like Toys R Us and The Sports Authority.

If your bike has a one piece crank, you will probably need 7" arms. If it is a cotterless crank (3 piece) you probably have 170mm arms. Don't forget to replace the spindle and all the bearings while you are at it.

Should you be talking about the number of teeth, just count them. Source(s): 27 years in the industry
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