# What is Bike Rim ERD?

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Effective Rim Diameter (ERD) is the diameter on which you want the ends of the spokes to lie. … Do this at several spots around the rim and average the measurements. 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).

## How is a bicycle rim measured?

You may measure the circumference of a rim by wrapping a measuring tape all the way around the rim. You derive the diameter from the circumference. A narrow, metal tape measure — 1/4 inch or 6 mm wide — will fit into the well of the rim.

## How do you measure rim diameter?

The definition of wheel diameter is the distance, in inches, measured across the face of the wheel, from bead seat to bead seat. As depicted in the diagram, you will notice the measurement stops at the bead seat and is not measured the full face of the wheel.

## What is a rim on a bike?

The rim is the “outer edge of a wheel, holding the tire”. … For example, on a bicycle wheel the rim is a large hoop attached to the outer ends of the spokes of the wheel that holds the tire and tube.

## Is my bike rim bent?

So, noticeably uneven spoke tension in a true wheel is one sign that the rim might be bent. If you remove the tire and loosen all spokes completely, or better remove them as well, and put the rim on a flat surface, it should become clear if the rim is bent or not.

## What size bike wheel should I get for my height?

Inseam Height Road bike wheel size
Less than 27″ 5′ to 5’4″ Bikes with 26″, 29″, and 700cc wheels may fit this rider.
27″ to 29″ 5′ 3″ to 5′ 7″ Bikes with 26″, 29″, and 700cc wheels may fit this rider.
29″ to 31″ 5′ 6″ to 5′ 11″ Bikes with 26″, 29″, and 700cc wheels may fit this rider.
31″ to 33″ 5′ 10″ to 6′ 3″

## IS 700c same as 28?

700c (622) is usually the same as 28″, and is the same as 29″. The interesting thing about this is that 700c is smaller than 27″. A 28″ could also be the 650B (584mm rim size), like some of us mountain bikers are using in between the 26 and 29 inch size….

## What rim width do I need?

Equivalency table

Rim width Minimum tire width Ideal tire width
5,0 Inches 155 mm 165 or 175 mm
5,5 Inches 165 mm 175 or 185 mm
6,0 Inches 175 mm 185 or 195 mm
6,5 Inches 185 mm 195 or 205 mm

## What do rim size numbers mean?

The wheel size is the size designation of a wheel given by its diameter, width, and offset. … For example, 17 x 8.5 x +35 designates a diameter of 17 inches, width of 8.5 inches, and +35 mm positive offset (432 × 216 x +35 in fully metric numbers).

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## How do you read a wheel offset?

What is Wheel Offset?

1. Zero wheel offset is when the hub mounting surface is in line with the centerline of the wheel.
2. Positive wheel offset is when the hub mounting surface is in front (more toward the street side) of the centerline of the wheel. …
3. Negative offset is when the hub mounting surface is behind the wheel centerline.

## What goes inside a bike tire?

Most bicycles today have tires with tubes inside. The tube is made of rubber, has a valve in it for inflation, and is just the right size and shape to fit inside the tire. When you inflate most tires, you are actually pumping air into the tube inside the tire, which fills the tire.

## Is wheel and rim the same thing?

Many people use term “wheel” as a “rim” meaning the entire metal part to which the tire is mounted because rim and wheel are usually cast or pressed from a single piece of metal. The main difference between wheel and rim is that rim is not the whole wheel but only a part of the wheel.

## IS 700C same as 29?

29″ (ISO size 622) is actually the same rim diameter as 700C, although most 29″ tires will not fit 700C road rims because they’re too wide. 29″ tires are popular with mountain bikers; search for 29″ MTB. … 700C (ISO size 622) is the most commonly used size for modern road bikes.

## Can you fix a bent rim on a bike?

Rims can get bent out of shape from hitting a big pothole, by getting twisted when you try to wedge your bike in or out of a rack and when a spoke breaks. … Fixing a moderately bent rim yourself is easily accomplished with a spoke wrench, which comes in several sizes.

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## How much does it cost to fix a bent bike rim?

If the wheel is fixable–it generally looks good but has a wobble–you can expect your local bike shop to charge \$20 – \$30 to true it using professional equipment like a truing stand for the perfect line and roundness.