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# How is rim ERD calculated?

## How is rim ERD calculated?

Measure the length of a nipple (dimension B in the figure) and add it twice (once for each nipple). The result is Effective Rim Diameter (ERD). Thus, ERD = A + 2B.

## How many spokes do I need?

The numbers can be as few as 16 or as many as 48. Less spokes result a marginally better aerodynamic advantage, while more spokes mean a stronger wheel. Bikes intended for racing typically have a low spoke count while bikes built to bear a lot of weight come with a high spoke count.

What size spokes do I need for 29er?

Common Spoke Lengths

Holes Rim Type Rear-O/S
32 XM319 26″ 258
32 X319 650B (27.5″) Disc 272
32 XM319 29er Disc 290
32 XM719 260

### How close should spoke lengths be?

For most folks, too long or two short really doesn’t matter as long as it’s within about 2 mm, so just round to whichever stock size is closest to ideal. If you go beyond the 2 mm, it is better to be a little short than long.

### Does 1mm make a difference in spoke length?

One of the reason is that if the spoke is 1mm longer than it needs to be, then the builder may not be able to get the proper tension on the spoke, because they run out of threads on the spoke since you have to turn the nipple in further to make up for the extra length.

How long are the spokes on a 26 inch bike wheel?

BICYCLE WHEEL SPOKES FOR STANDARD 26″ WHEEL SCHWINN BIKES AND OTHERS 10 – 5/8″ THIS IS A COMPLETE SET OF SPOKES FOR 26″ TIRE SIZE / WHEELS. THEY WILL FIT MANY WHEELS OF MANY BRANDS, YOU GET ALL 36 SPOKES WITH NIPPLES, THEY ARE SIZE 10 – 5/8″ LONG.

#### What tension should spokes be?

Most rims have suggested ranges from 100 to 120 Kilograms-force, or 980 to 1177 Newtons. This is assuming there is no pressure in the tire. Though not super precise, squeezing is still a more accurate technique for judging spoke tension than feeling the amount of effort it takes to turn a spoke nipple.

#### What size spoke do I need for a 26 wheel?

BICYCLE WHEEL SPOKES FOR STANDARD 26″ WHEEL SCHWINN BIKES AND OTHERS 10 – 5/8″ THIS IS A COMPLETE SET OF SPOKES FOR 26″ TIRE SIZE / WHEELS. THEY WILL FIT MANY WHEELS OF MANY BRANDS, YOU GET ALL 36 SPOKES WITH NIPPLES, THEY ARE SIZE 10 – 5/8″ LONG. THEY USED ON MANY SCHWINN FRONT WHEELS, WILL FIT FRONT 26″ S-2 & OTHERS.