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    A bit about us

    Welcome to our new website. We've spent a lot of time re-designing the site, listening to what you want and making the whole experience better. 

    You will notice that we use actual stock levels so you know when it's in stock and when it isn't. We have a fully integrated live stock system that handles stock from in store and online from one central database - plus we have live stock information from our key suppliers that allows you to see beyond what we have here within these four walls. This all helps to reduce the times you have to get an email to say what you ordered isn't available. 

    We know you're always looking for the latest stuff, so we work hard on bringing you hottest new stuff first. Available to order now with availability dates so you can place a Pre Order and get it before anyone else. 

    Our new Checkout process allows you to check out by creating an account, signing in to an existing account (your account from our previous site will still work), a "Guest" checkout so you don't need to create an account, lastly you can just Express Checkout with Paypal. 

    Finally our new shipping options allow you greater control on how your order is delivered with realistic delivery times - so you'll know when you'll get it. You get despatch and tracking information (when available) with all orders.

    Last of all if you have any questions, email sales@alansbmx.com or just call us on 01942 826598.

    If you have time please do some Reviews of the products you have used on here. 

    Thanks again for checking us out. 

    Alan Woods. 

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  • £24.99
    Save 7%

    Tioga Power Block OS20 Race Tyre

    Tyres for the new OS20 wheel size. 1.6 or 1.85. Also available in kevlar folding version (lighter). 

    • 1.85
    • £24.99
    • 2 in stock
    • Check Store Availability
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    Tioga Power Block OS20 Race Tyre Video


    With Pre-Order, you can purchase the latest items added to our store in advance of them arriving with us.

    You Pre-Order is prioritised (at no additional charge); meaning that, as soon as the product arrives with us, we can wrap it straight back up and get it sent out to you - it often never even hits the stock room shelves!


    With Pre-Launch, the date when we expect to receive the product ourselves is still a little too hazy to be confident in accepting Pre-Orders.

    So, instead, you can submit your email address against the item you are interested in and we will email you as soon as stock arrives on the system.

    Estimated Delivery Dates

    Estimated Delivery Dates are given on Pre-Order and Pre-Launch products. They are for indication purposes only and can change at any time without notice.

    The dates we provide are based on indications given by our suppliers. Whenever we get updated information from our suppliers we will endeavour to update the Estimated Delivery Dates provided on product pages.

    The Current Estimated Delivery Dates for Tioga Power Block OS20 Race Tyre is

    Tioga Power Block OS20 Race Tyre Description

  • Brand : Tioga
  • Season :
  • Code : TIOTY013BK
  • Weight : 0KG
  • Power Block was designed in co-operation with top riders to excel on modern style, hard and fast tracks. A slick centre profile with lightly ribbed cornering tread makes this the fastest BMX tyre in the range.

    UTC rubber compound

    Steel bead



    What Is OS20?

    OS20 is NOT 22”. OS20 is 20”, but bigger. There are two wheel sizes in the 20” category – the 20” on Jr/mini bikes which uses the 451mm diameter wheel in narrow widths (for 20-1/8” & 20-3/8” tires), and the conventional 20” which uses the smaller 406mm diameter wheel but in wider widths. OS20 is 451mm wheel diameter in similar widths as 406mm wheels. 

    OS20 tyres are not compatible with Jr/Mini sized rims, and OS20 rims are not compatible with Jr/Mini sized tyres. 


    Is OS20 Race Legal?

    Independently verified, OS20 wheel and tires are within UCI and USA BMX sizing regulations for 20”. 


    What Do I Need For OS20?

    OS20 specific frame, OS20 specific wheels and tires (including OS20 rim strip and OS20 innertubes) are essential for OS20. Many current front forks made for 20” bikes will work with OS20. 


    Why OS20?

    OS20 rolls faster and retains greater forward momentum. This is achieved by a few factors.

    First, it is well understood that minimising the energy loss from the tire casing's deflection is key to reducing rolling resistance. The tire's sidewall compressing when weight is applied is one example of casing deflection. When compared with 20”, OS20, with its larger diameter and greater air volume, exhibit a smaller proportion of its casing deflecting as it rolls – so smaller casing deflection, less energy loss. 

    Second, the shape of the tire's contact patch also affects rolling characteristics. The contact patch the shape of the tread as it meets the ground. OS20 tire's larger air volume creates a different contact patch due to less casing deflection (see above). OS20 tires exhibit a smaller 

    footprint resulting in lower rolling resistance. 

    Another benefit of smaller casing deflection is being able to maintain more forward momentum. As larger diameter tire casings deflect less when rolling, less energy is wasted in overcoming the casing deflection, thus more forward momentum is maintained. OS20 has potential for higher top-end speed and more efficiently maintains the speed. 

    When the difference between first and not is a fraction of a second, OS20 has the potential to be the winning edge. 



    •  60 TPI casing

    •  UTC Rubber Compound

    •  Wire Bead



    •  OS20 x 1.85

    •  OS20 x 1.60

    •  15.17oz; 430g

    •  12.27oz; 348g


    Also available in lighter folding kevlar version. 


    Buyers Guide

    Sizing Information

    Technical Information

    Tioga Power Block OS20 Race Tyre
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