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170/70 R17 Tyres

Everything we know about the 170/70 R17 tyre size: 4 owner reviews covering 19,500 miles of driving, and EU label data for the tyres you can actually buy in it.

  • 4owner reviews
  • 19,500 milescovered on them
170/70 R17 To scale, mm
Ø 670 170 119 17" 119

What does 170/70 R17 mean?

A 170/70 R17 tyre is 170 mm wide, its sidewall is 70% of that width (119 mm) tall, and it fits a 17 inch wheel. That gives an overall diameter of roughly 670 mm.

170/70 R17 nominal dimensions
Section width170 mm
Sidewall height119 mm
Rim diameter17" (432 mm)
Overall diameter≈ 670 mm
Circumference≈ 2,104 mm
Revolutions per km≈ 475
Revolutions per mile≈ 765

Also written as

170/70R17 170/70 ZR17 170-70-17 170 70 17

Figures are calculated from the nominal size. A loaded, rolling tyre runs a few percent smaller, and true widths vary slightly between makes.

Comparing two sizes? Use the tyre size calculator →

What cars use 170/70 R17 tyres?

The cars most often running this size in our owner reviews. Each links to the best rated tyres for that exact car.

What drivers say about their 170/70 R17 tyres

The most recent owner reviews fitted in this size, in their own words.

91%
Michelin Pilot Power 2CT 170/70 R17 Triumph Street Triple RS 4,000 miles October 28, 2025
my go to tyre on my last few bikes.. 04 R6 09 FZ1 20 Street Triple 765 . just ordered a set for my 24 Speed Twin 1200. generally ride in all weathers when time allows and all year round. thought about trying a different tyre but while still available, cannot fault them
69%
Bridgestone Battlax Hypersport S22 170/70 R17 Yamaha MT09 500 miles April 10, 2023
S22 OEM mt09sp is a fab tire for fast sport riders but boy do they wear fast, I have owned bike 3 years and went through 2 rears and one front in 5000 miles the center flat spots real fast on the rear with noticeable wear after 500 miles and the front shows good tred but road camber flat spots on tire makes it a bit disappointing as you would expect the tire to wear more even another issue is wet grip they never felt capable in damp or consent rain conditions I think due to tread pattern, they can't clear water fast enough, for that point I'm not putting these back on the bike as better harder wearing black hoops out there now
0%
Dunlop RoadSmart III 170/70 R17 Yamaha TDM850 10,000 miles June 26, 2019
Outstanding tyres, never felt loosing grip both dry and wet roads. Very long mileage - 16500 km (10000 miles), half with luggage and passenger on mountain roads. Replaced with Michelin Pilot Road 4, also good tyres but very noisy compare to Dunlop. Definitely the best tyres I ever had on my Yamaha!
93%
Avon Storm 2 Ultra 170/70 R17 Triumph Trophy 1200 5,000 miles October 27, 2010
Fitted to a BIG tRIUMPH tROPHY 1200 and used "Sportingly", these bueaties have lasted well and really inspire confidence.
Bit disappointed to get 5,000 miles out of teh front and shoed significant wear on just the one side, but the rear is still measuring 5mm after 5,000 miles so can'tcomplain really.

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Where this data comes from

Owner ratings are submitted through the review form on this site, naming the tyre, the size and the distance covered, and are checked by hand before publication. Test results come from independent published tyre tests indexed by size, and label values from the EU EPREL database.

About the TR Score

The Tyre Reviews Score rates each tyre out of 10 using independent test results and the full body of owner reviews, so you can check a car-specific ranking against the wider evidence.

Who does the testing

Every test published as a Tyre Reviews test is run by Jonathan Benson, who has been testing tyres independently since 2007.

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