Tube sizing..need help..

Discussion in 'Technical & Maintenance' started by Mac, Nov 28, 2017.

  1. Mac

    Mac Member

    ...have a 140/80-17 front tire on bike.....wondered if anyone knew if a tube sized 150-160/70R17 would be the correct tube to buy for this tire..? ...been googling....but having poor results..

    ....had planned on a new Bridgestone.....any info would be appreciated..
     
  2. Wayne

    Wayne Well-Known Member

    Not sure how tubes are measured for tires. But 140 is the mm of the width of the tire tread and 80 is 80% of the 140mm for the sidewall height, which is 112mm. And 160/70 has the same sidewall height, but 20mm wider tread. I'm sure it would get you out of a jam. But tubes do heat up and can fail, so I can't recommend using that. Maybe someone else will chime in.
     
  3. Mac

    Mac Member

    Thanks Wayne..
    ...talked with a few dealers and they seem confused since the size never came up...so they recommended 5.05 - 5.10 17.....went back online to Fortnine and they have Michelin and a listing in a group that the 140 falls into...may just order a Michelin and see how it goes...only thing that bothered me was that the Michelin pics show brass valve stems...when I would rather the more nickle like as Bridgestone has..anyone have the newer Michelin ?...is it brass or metal like?
     
  4. Wayne

    Wayne Well-Known Member

    If it’s just for looks, you can buy sleeves that slide over the stem before you put the valve cap on.
     

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