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All Bikes Hand Checked & Assembled Before Shipping Free tracked delivery 90 day Returns 30-Day Test Ride Option Customer Care: 0330 555 0080 0% Finance

Free, tracked UK delivery on orders over £10

We offer free, tracked UK delivery on orders over £10, with delivery starting from £1.99 for orders below this value. We also have a selection of premium shipping options available including timed slots, Saturday delivery and DPD Pick-up

All of our bicycles are fully built by our experienced and certified mechanics prior to delivery; all you will need to do is turn the handlebars and fit some pedals.

Bicycles are shipped from a different warehouse to other items and so may arrive in advance of any other items you have ordered.

View all Delivery Options

90-Day UK Returns for all items

We want you to be 100% satisfied with your shopping experience at Rutland Cycling, so we offer a 90-day exchange or refund on any unused item (within the UK).

We've chosen to offer products at the very lowest prices, rather than provide a free returns service. If you do need to return an item, we provide printable postage labels and collection services at a small cost for all items - including bicycles.

See our full Returns policy.

30 Day Test Ride

All the convenience of buying online, without the risk
When you buy a new bike at full RRP from, you can now benefit from the added reassurance of our Rutland 30-day test ride. Once your new bike arrives, you can ride it as your own for 30 days, and we're confident you'll love it! However, if it's not right for you, we'll exchange it for another model. (There's a nominal charge of £10 for us to collect your bike - just make sure you keep the box your bike arrived in.)

On which bikes is the 30-day test ride available?
The Rutland 30-day test ride is available on all full price, non-discounted bikes available for home delivery on It is not available on discounted or special offer bikes, click and collect bikes, bikes bought on finance, bikes bought through Cyclescheme, or bikes bought in store. This offer is only available on bikes delivered to mainland UK addresses.

How many times can I use the 30-day test ride?
We will allow up to two exchanges within this scheme.

Full T's & C's

Finance your purchase

Get a confidential decision online in seconds.

At Rutland Cycling, we offer Finance on orders over £250, with 0% finance up to 36 months available on selected bikes, including some sale bikes. Visit the product page to see which finance products are available.

You can apply for Finance online or in store. To apply online, add your selected items to your basket, then checkout as normal. Select Finance as your payment method, fill in the application form, then complete your order.

See our Finance page for more information.

  • Back to Blog  

    Helmet Size Guide

       Words by Harry Archer

       on 13/03/2018 13:43:35


    Our helmet size guides below show you how to measure your head properly, to get the best fit.


    How do I choose the right size?

    1. Measure your head with a tape measure

    Top tips: Ask a friend to help – it tends to improve accuracy. Keep the tape measure snug but not tight.


    Measure around the centre of your forehead just above your ears, crossing the bumpy bone at the back of your head (occipital bone).

    2. Find your size, using the tables below

    Remember, all sizing information is a guide only. If you have any questions about bike sizing, our expert team is here to help. Call us on 0330 555 0080, use our Live Chat, or email us.

    Helmets – Size Charts

    See below for specific sizing charts for Specialized, Kask, Met and Giant

    Specialized Helmet Size Charts

    Adult 3-Size

    Helmet Size Cir. (in) Cir. (cm)
    Small 20"-22" 51-56cm
    Medium 21.75"-23.25" 55-59cm
    Large 23.25"-24.75" 59-63cm

    Universal Adult Sizing

    Model Cir. (in) Cir. (cm)
    Max 22"-25.25" 56-64cm
    Align 21.25"-24.5" 54-62cm
    Chamonix 21.25"-24.5" 54-62cm
    Centro 21.25"-24.5" 54-62cm
    Sierra 19.75"-23" 50-58cm
    Duet 19.75"-23" 50-58cm


    Helmet Size Cir. (in) Cir. (cm)
    Small 20"-22" 51-56cm
    Medium 21.25"-23" 54-58cm
    Large 22.5"-24" 57-61cm
    X Large 23.25"-24.75" 59-63cm

    Adult MIPS 3 Size

    Helmet Size Cir. (in) Cir. (cm)
    Small 20"-22" 51-56cm
    Medium 21.25"-23.5" 54-59cm
    Large 22.5"-24.75" 57-63cm

    Universal MIPS Adult Sizing

    Model Cir. (in) Cir. (cm)
    Chamonix 21.25"-23.5" 54-59cm
    Duet 19.75"-23" 50-58cm


    Helmet Size Cir. (in) Cir. (cm)
    X Small 18.5"-20.75" 47-53cm
    Small 20.5"-22" 52-56cm
    Medium 22"-23.5" 56-60cm
    Large 23.5"-24.75" 60-63cm

    S-Works TT

    Helmet Size Cir. (in) Cir. (cm)
    X Small/Small 20"-22.5" 51-57cm
    Medium/Large 21.25"-23.5" 54-60cm

    Dissident/Dissient Comp

    Helmet Size Cir. (in) Cir. (cm)
    Small 21.25"-21.75" 54-55cm
    Medium 22"-22.5" 56-57cm
    Large 22.5"-23.25" 58-59cm
    X Large 23.5"-24.25" 60-62cm

    Universal Fit Youth Sizing

    Model Cir. (in) Cir. (cm)
    Mio 17.5"-20" 46-51cm
    Shuffle Child 19.75"-21.75" 50-55cm
    Shuffle Youth 20.5"-22.5" 52-57cm
    Flash 19.75"-23" 50-58cm

    Small Fry

    Helmet Size Cir. (in) Cir. (cm)
    Toddler 17.5"-20.5" 44-52cm
    Child 18.5"-21.75" 47-55cm

    Kask Helmet Size Charts

    Infinity / Rex / Rapido

    Helmet Size Cir. (in) Cir. (cm)
    Medium 20.5"-22.75" 52-58cm
    Large 23.25"-24.5" 59-62cm

    Protone / Valegro

    Helmet Size Cir. (in) Cir. (cm)
    Small 19.75"-23.1" 50-56cm
    Medium 20.5"-22.75" 52-58cm
    Large 23.25"-24.5"" 59-62cm

    Bambino Pro / Mistral

    Helmet Size Cir. (in) Cir. (cm)
    Medium 21.75"-22.75" 55-58cm
    Large 23.25"-24.5" 59-62cm


    Helmet Size Cir. (in) Cir. (cm)
    Small 18.25"-22.1" 48-56cm
    Medium 18.75"-22.75" 52-58cm
    Large 23.25"-24.5"" 59-62cm
    X Large 23.75"-25.25" 63-64cm

    Met Helmet Size Charts

    MET Child Universal

    Model Cir. (in) Cir. (cm)
    Crackerjack 20.5"-22.5" 52-57cm
    Elfo 18.25"-20.75" 46-53cm
    Genio 20.5"-22.5" 52-57cm

    Giant Helmet Size Charts

    Adult Helmet Sizes

    Helmet Size Cir. (in) Cir. (cm)
    Small 20.25"-21.75" 51-55cm
    Medium 21.75"-23.25" 55-59cm
    Large 23.25"-24.75" 59-63cm


    Helmet Size Cir. (in) Cir. (cm)
    Small/Medium 19.25"-22.5" 49-57cm
    Medium/Large 20.75"-24" 53-61cm

    Holler Kids

    Helmet Size Cir. (in) Cir. (cm)
    One Size 18.25"-20.25" 46-51cm

    Hoot Kids

    Helmet Size Cir. (in) Cir. (cm)
    One Size 19.75"-21.75" 50-55cm

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