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Originally Posted by Dualsport Chic
Great idea Spud - I really like the weight savings with the new rim. Just would have to source a rim and have it laced which sounds expensive...
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I spent about $130 for my Warp9 rim, size 2.50-17. Wheel builders usually charge anywhere from $60-$100 to lace, and true a wheel.
Quote:
Originally Posted by Dualsport Chic
...If I decided not to change the rim, would the tire profile size make much of a difference? Really like the Heidenau tires - they have a size 130/80-17 rear available - would it fit? And if so, how much would it raise the height of the bike over the 130/70-17 OEM tire? I would assume 1 cm which = less than 1/2 an inch?...
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A size 130/80-17 tire is 130 mm wide. The aspect ratio is 80, which means the tire's side wall is (0.8 x 130 mm) tall, or 104 mm tall. A size 130/70-17 tire is 130 mm wide. However, the aspect ratio for this tire is 70, which means the tire's side wall is (0.7 x 130 mm) tall, or 91 mm tall. Therefore, the tire with the larger aspect ratio is (104 - 91)mm taller, or 13 mm taller, which will raise the saddle height about 1/2-inch.
Many tire manufacturers provide a fitment chart, which tells you the size rim for which a particular tire is designed. You can usually mount a tire onto a rim which is either one size above, or one size below the specified rim.
For example, the Shinko 244 tire, size 4.60-17, is designed for a 2.15 inch rim. It has a diameter of 24.76 inches.
http://www.shinkotireusa.com/tire/244-series
Therefore, I can mount this tire on a size 2.50 rim, but not a size 3.00 rim.
The Shinko 244 tire, size 5.10-17, is designed for a 3.00 inch rim. It has a diameter of 25.63 inches. Therefore, the larger tire will raise the saddle height about .435 inches, which is 1/2 the difference in the diameters.
As far as I can see, the Heidenau tire website does not provide a fitment chart.
http://heidenautires.com/dual-sport-tires/
However, as a general rule, size 5.10, and 130 mm tires are designed for 3-inch rims. Size 4.60, and 110 mm tires are designed for 2.15-inch rims. Therefore, both the 130/80-17 tire, and the 130/70-17 tire will probably fit the 3-inch rim of your RX3 bike. However, the 130/70-17 tire will lower the saddle height about 1/2-inch, compared with the 130/80-17 tire.
Quote:
Originally Posted by Dualsport Chic
...Sorry for the silly questions but I've honestly never had to deviate from the OEM tire sizes on my bikes as they were all pretty easy to find through several manufacturers.
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You questions are not silly; they are intelligent questions.
Indeed, the choice of a rear tire can make a
big difference in saddle height.