Bontrager R4 320 tyres review

We have been testing all the leading summer tyres against each other. We see if the tan sidewalls on the Bontrager R4 320 tyres are a case of style over substance

bontrager r4 320 tyres on rim
Cycling Weekly Verdict

Put simply, Bontrager R4 320 tyres are the fastest tyres we have tested. The puncture protection is good, but owing to the supple tread and high price, we would recommend they are best saved for special occasions

Reasons to buy
  • +

    Demonstratably and significantly faster than other tyres

  • +

    Look great

  • +

    Good puncture protection

  • +

    Good grip

Reasons to avoid
  • -


  • -

    Won't last as long as other tyres

You can trust Cycling Weekly. Our team of experts put in hard miles testing cycling tech and will always share honest, unbiased advice to help you choose. Find out more about how we test.

The Bontrager R4 320 tyres, as the name suggests, feature 320 threads per inch, giving a very supple tyre with very low rolling resistance. When testing the rolling resistance of different tyres, the Bontrager R4 320 tyres have earned the esteemed prize of being the fastest tyre we have ever tested.

Engineer and pro rider, Dan Bigham helped me calculate the rolling resistance for different tyres currently available on the market. Each set of tyres were ridden on rollers, allowing us to record the speed achieved for a given power output.

Thank you for reading 20 articles this month* Join now for unlimited access

Enjoy your first month for just £1 / $1 / €1

*Read 5 free articles per month without a subscription

Join now for unlimited access

Try first month for just £1 / $1 / €1

Oliver Bridgewood - no, Doctor Oliver Bridgewood - is a PhD Chemist who discovered a love of cycling. He enjoys racing time trials, hill climbs, road races and criteriums. During his time at Cycling Weekly, he worked predominantly within the tech team, also utilising his science background to produce insightful fitness articles, before moving to an entirely video-focused role heading up the Cycling Weekly YouTube channel, where his feature-length documentary 'Project 49' was his crowning glory.