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Does anyone know or can measure the diameter of the handlebars for the Carerra TDF road bike from Halfords.

It was bought a few years ago and the similar specs on the site aren't helpful.

This would be at the point where you'd fit cross top levers, so not at the stem.

Update. It's not my bike hence why I can't measure it. Otherwise I wouldn't be asking. Hoping someone has it and can measure or already knows.

Update 2. I'd hoped to get lucky and that someone here had this bike. Is anyone good at eyeballing the diameter from a video?

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    If you don't own a calliper (there are really cheap ones around) you can alternatively measure the circumference and divide by 3.14.
    – Carel
    Dec 16, 2016 at 12:58
  • See edit. Not my bike I'm afraid
    – Adam
    Dec 17, 2016 at 0:21
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    begs the question - Why do you want to find its handlebar diameter, if you can't access the bike ? Why can't you get the current owner to measure it?
    – Criggie ♦
    Dec 17, 2016 at 0:33
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    It's a christmas present. That would ruin the surprise.
    – Adam
    Dec 17, 2016 at 10:54
  • I clarified the title which is misleading, but because it now (accurately) reflects the content, this is likely to be closed as too specific to your particular model.
    – RoboKaren
    Dec 17, 2016 at 15:57

3 Answers 3

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Do you have access to calipers? Similar to these. (Pretty handy device to have around if not).

Otherwise, you could take a small string and wrap it around the bars put a mark at the point of overlap, measure with a ruler, then put that high school math to use (diameter = circumference / pi)

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  • See edit. Not my bike I'm afraid
    – Adam
    Dec 17, 2016 at 0:21
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Based on your video, its a 1" / 25.4 mm diameter handlebar. Simply keep the receipt/exchange card as a contingency plan.

Or consider giving a gift voucher instead so cyclist can buy exactly what they want.

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If you can't get a picture of the bike to eyeball 25.4/26(~1") vs 31.8(~1 1/4"), which would rule out 2 of the three, also making sure its a round clamping surface, most low end cross top levers as well as clip on aerobars come with shims, if that's your intention.

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  • I can find pictures, but I can't tell. Can you tell from the video in my edit?
    – Adam
    Dec 17, 2016 at 18:30

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