Author Topic: Tyre & Inner Tube Conversion Charts  (Read 171 times)

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Tyre & Inner Tube Conversion Charts
« on: July 26, 2017, 10:19:50 »
For those not in Europe having to struggle with inner tube sizes quoted in inches for tyres quoted in metric sizes.

On the CRF1000L
Front Tyre: 90/90-R21  will take inner tube: 2.75" / 3.00" x 21
Rear Tyre: 150/70-R18 will take inner tube: 5.0" / 5.10" x 18

From what I have read, it is not recommended to use heavy duty inner tubes for general road touring use.  It seems that at prolonged high speeds heat build up can cause issues/punctures and also the increased weight of a thicker tube will add to the unsprung weight of the wheel and affect handling at higher speeds due to an increased gyroscopic effect.

Conversion charts can be found at:

Let the debate begin! ;)
James Mc

Current: 2017 CRF1000L DCT
Current: 2008 Triumph Tiger 1050
Previous: 2003 Honda Varadero XL1000V (bought 2003, sold 2013 - Sadly left behind in Europe)


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Re: Tyre & Inner Tube Conversion Charts
« Reply #1 on: July 26, 2017, 12:28:27 »
Surely right, but after my front puncture on the road, and my rear change of the tire, have (and after reflection  8) ) put both heavy tubes; my program is more off road, and never highways ... So for instance no noticeable change ... 21" front wheel have ask me a little bit education after so much 19" , yes there is a little more gyroscopic effect ; but no noticeable change on the kilometers done, only much more confiance on stony tracks with reinforced inners.
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