How To Set Bike Computer

You have bought a new bike computer and desire to set information technology up correctly? At the step where you enter the wheel circumference into the cycle speedometer, there are dissimilar procedures.

In this commodity you volition learn 3 means to fix your bicycle computer correctly.

✅ Calculate bike circumference with formula
✅ Measure wheel circumference
✅ Fix bike calculator with table

The 3 methods are explained in this commodity simple and understandable. In add-on, I explain the advantages and disadvantages of the methods.

If your bike reckoner is currently showing wrong readings, then this article will virtually likely assist you as well. You lot volition also learn how to cheque the right setting.

First, the wheel computer must exist mounted correctly. Therefore, nosotros first get-go with the cycle calculator mounting:

Bike reckoner: The right mounting

Virtually all bike computers tin can exist mounted without tools. Each bike computer comes with a magnet and a sensor. This is how you go on when mounting the bike computer:

1. Attach the supplied magnet to the spokes. Information technology does not affair at which position the magnet is attached. Please note: The magnet and the sensor must exist at the same height and the distance betwixt them must not be besides big. In exercise 5 mm is a good altitude
2. Attach the sensor to the fork at the level of the magnet.
3. For a bicycle computer with cable: Lay the cablevision from the handlebar to the fork (from the bike computer to the sensor). With a wireless bike computer this step is omitted

In the video, all steps are clearly shown using the pop Sigma BC 14.sixteen (with cable) as an instance:

Tip: Cable ties are very helpful during assembly. Sometimes cable ties are likewise included. Nigh of the time, the wheel calculator sensor is held in place with ane or more than rubber bands. In the beginning, this ordinarily works quite well. After a certain time, the prophylactic can then unfortunately become breakable. One or more cable ties will and then hold the sensor securely in identify.

Setting the wheel computer correctly

If your bike computer is mounted correctly, you tin can now ready the bicycle calculator properly. For this I will show three possibilities and you lot will learn the advantages and disadvantages of the methods.

I recommend y'all method 2 "Measure cycle circumference with tire rotation". The result with the bike computer correctly set here volition be the most right. With this method your weight and also the tire condition including air pressure are included.

Summate wheel circumference with formula

The quick method for setting the bicycle speedometer! This method involves measuring the cycle tire: The radius of the bicycle tire is determined with a folding rule. With the formula U = 2 * pi * r (where the circle number pi = 3.xiv) you and then summate the wheel circumference.

The radius of the cycle tire is measured from the outermost point of the casing to the center of the axle.

These are the steps:

1. Inflate tyres
2. Using a folding dominion, measure the radius from the bicycle tire.
3. The determined radius in mm into the formula U = 2 * pi * r.

Decision on the method (calculate bicycle circumference with formula)

✅ Easy and quick way, to make up one's mind the wheel circumference and adjust for the bicycle speedometer.
✅ Method includes the own bicycle circumference

Bad

The wheel circumference calculation method is relatively inaccurate. If y'all already have a folding rule at mitt, measure the tire circumference (next method).

Mensurate cycle circumference with tire rotation

This method is much more accurate. By measuring y'all direct make up one's mind the tire circumference:

1. Inflate tyres
2. At the point where the wheel points exactly downwards, make a mark on the bike casing and on the ground e.g. with a piece of chalk. Alternatively, you can also use the wheel valve equally a marking.
3. Gyre forward with the bike. Until the marking on the bicycle tire points exactly downwards again.
4. Measure the altitude travelled with a folding rule. The altitude travelled is the wheel circumference in millimetres
5. Enter value into your bicycle reckoner

Repeat the method a few times to become the almost accurate upshot.

In this short video the method is explained very understandably:

Your bike computer is ready upwardly correctly? It is best to drive a precisely measured route. With this you tin check the right setting and check whether the bike speedometer setting was successful.

Conclusion on the method (measure bicycle circumference with tire rotation)

For setting the cycle computer, utilise this method. It is quick and easy and the results are the most authentic.

Setting the wheel estimator with wheel circumference table (ETRTO table)

To determine the right wheel circumference, you practise not necessarily accept to measure. There is besides a handy cycle circumference nautical chart. There y'all tin can easily read the value for your wheel circumference.

In a wheel circumference chart, there are three of import specifications:

• The tire size in inches: The number indicates the approximate tire inner diameter in inches.
• ETRTO specification: ETRTO stands for European Tyre and Rim Expert Organisation. The ETRTO specification has the following format: 47-406. The first number, 47, is the tire width in mm. The second number, 406, is the inner diameter of the tyre in millimetres.
• gauge wheel circumference: This is the third and most important size. With the help of the ETRTO specification, you can read the approximate cycle circumference from the table.

If you have gear up the wheel circumference in your bike computer, then the speed and distance can exist recorded correctly from at present on. Adjusting the bike speedometer was successful 😉

Cycle circumference read off the tire: Here information technology is 29 inch diameter and two.1 inch width – withal works fifty-fifty with a dirty tire 🙂

Depending on the information on the tire, y'all can and then read the tertiary important size in the table, the bicycle circumference in mm. This value must and then be assault the bike figurer and then that the speed and distance are recorded correctly.

Depending on the tyre manufacturer, the wheel circumference is given slightly differently in the ETRTO tabular array. The source for the table below is the Schwalbe Tech Canvass. Manufacturers similar Sigma Sports likewise take their ain ETRTO tables for their bike computers.

By and large the ETRTO table is included in the delivery and is for example printed on the packaging or function of the transmission. Gear up bicycle calculator with table:

Customs	ETRTO	Bicycle circumference in mm
26″	35-559	1990 mm
	40-559	2030 mm
	47-559	2050 mm
	50-559	2075 mm
	54-559	2100 mm
	57-559	2120 mm
	lx-559	2160 mm
	37-590	2100 mm
27,5″	54-584	2195 mm
	57-584	2215 mm
	60-584	2240 mm
28″	20-622	2100 mm
	23-622	2125 mm
	25-622	2135 mm
	28-622	2150 mm
	30-622	2160 mm
	32-622	2170 mm
	35-622	2185 mm
	37-622	2200 mm
	xl-622	2220 mm
	42-622	2230 mm
	47-622	2250 mm
	l-622	2280 mm
	xl-635	2250 mm
29″	54-622	2310 mm
	57-622	2330 mm
	lx-622	2340 mm

On Mountainbike-Folio.de you will find a detailed compilation by tire manufacturer and tire type. With these tables you can determine the cycle circumference with the table method.

Conclusion on the method (setting the bike figurer with table)

✅ Quick and easy method for determining the wheel circumference
✅ many tire manufacturers offer individual tables

Bad

The wheel circumference table (ETRTO table) is not the nearly authentic method for determining your bicycle tire circumference. The values determined are simply approximations. Many factors play a role in the exact determination of the wheel tire circumference, e.k. the condition of the casing and the rim and especially your tire pressure. I therefore recommend measuring with the tire rotation to determine the bike circumference.

Were yous able to accommodate your bike estimator? Exercise you accept whatever questions? Then feel costless to drop me a comment – I'll be happy to answer.

Source: https://bikepacking-adventures.com/en/bicycle-speedometer-setup-wheel-circumference/

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