Author Topic: Tyre & Inner Tube Conversion Charts  (Read 1901 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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Re: Tyre & Inner Tube Conversion Charts
« Reply #2 on: July 17, 2018, 02:18:24 »
Evidence on the thickness of tubes seems to be mostly anecdotal. Thicker tubes will prevent pinch flats but are no better at stopping punctures (according to Dunlops website).
I've used only heavy duty and ultra heavy duty tubes for almost 25,000 kilometres without an issue. The only flat I got was a nail and it was with the OEM tube, though I don't think that any tube would have survived. No issues with heat build up even on the hottest of days in continuous use (days at 35 celcius plus for eight hours of riding on the highway). I wonder if you can feel the difference when turning with a heavy vs. lighter tube? Curious....
2016 CRF1000L Africa Twin
2016 CRF250L
2008 Varadero (gonzo - one of my favorite bikes)