Flat Track Technical | AAA Racing

Here is some useful technical data for all the Maxxis Flat Track Tyres, that we distribute

Regardless of the specific tyre you choose, on each tyre's specific detail page, there are tabs; Description, Specification, Rotation Image, Fitted Image etc. The Specification tab shows all the useful data for that specific tyre, including its road legal usage (if or where applicable) and the correct recommended rim size, together with all the other appropriate data for the tyre's usage

As Maxxis DTR1 exclusive distributors in the UK & EIRE, we provide a lot of useful information about these tyres, shown within various different sections on the page below. If you need advice on engine tuning, race-craft or marriage (!) there are far better people out there who can help you!

17" & 19" Maxxis DTR1 - Rim Sizes?

The main problem for most UK riders, is that when converting a MotoX or Enduro bike to a Flat Track race bike (using the Maxxis specified standard rim sizes fitted with DTR1 Tyres) is that the resultant wheel / tyre combination won't actually fit on their bike. They are quite simply too wide! The DTR1 is a wide tyre because 'genuine' Flat Track bikes feature wider triple clamps and swing arms than all of those types of conversions that we've mentioned

Consequently and ignoring the official Maxxis recommended rim size specifications for a moment, the most popular rim sizes (for these types of MotoX or Enduro bike conversions) when using 19" DTR1 tyres are 2.15" (WM3) & 2.5" (WM4) front and 2.5" (WM4) and 2.75" (WM4.5) rear. Yes... We know this doesn't really make sense, but it works. We have actually seen 19" DTR1 front tyres, fitted onto wheels using 1.85" (WM2) rims, but that was a little bit borderline... Finally, thanks to wheel building deals and other financial incentives, quite a few UK riders are using the same size rims (2.15" or 2.5" in many cases) on both their front and rear 19" wheels

For 17" DTR1 tyres, which we've finally, but only very recently been able to receive our stock of, we'll add similar information as soon as we've spent sufficient time measuring them on different rim sizes. The same type of wheel / tyre combination width challenges will apply, but on a smaller scale as the manufacturer's recommended rim size is smaller to start with i.e. 2.75" (WM4.5)

17" & 19" Maxxis DTR1 - Rim Sizes / Resultant Tyre Widths?

A very popular question! Remembering that there are variables (e.g. wheel manufacturer's specific rim design, different inflation pressures etc) shown below, are approximate 19" DTR1 tyre width measurements, when fitted to popular UK rim sizes and inflated to 1.379 Bar (20 PSI) These may be useful when you're at the design and build stage of your Flat Track / Project Bike

Front 19" DTR1 Tyre: 130/80 x 19 (27.0-7.0 x 19)

  • Rim: 1.85" (WM2) Tyre: 119.1 mm (4-11/16")
  • Rim: 2.15" (WM3) Tyre: 128.6 mm (5-1/16")
  • Rim: 2.50" (WM4) Tyre: 131.8 mm (5-3/16")

Rear 19" DTR1 Tyre: 140/80 x 19 (27.5-7.5 x 19)

  • Rim: 2.15" (WM3) Tyre: 141.3mm (5-9/16")
  • Rim: 2.50" (WM4) Tyre: 144.5 mm (5-11/16")
  • Rim: 2.75" (WM4.5) Tyre: 146.1mm (5-3/4")
  • Rim: 3.00" (WM5) Tyre: 147.7mm (5-13/16")

These approximate tyre section width measurements are in addition to the two Maxxis official section width measurements, which are shown on the image at the bottom of this page (NB: When fitted to the two specified rim sizes (WM5 & WM6) that are also clearly shown in the same image)

See our note above re the 17" DTR1 tyre's very recent arrival here, so just as before, we'll add more relevant details as soon as we can, but meantime, the manufacturer's stated tyre section width, when using the recommended 2.75" (WM4.5) rim size is 120.65mm (4.75")

17" & 19" Maxxis DTR1 Tyres - Tubed Tyres or Tubeless?

All the 19" Maxxis DTR1 tyres that we supply are Tubed Tyres (TT) whilst all the 17" Maxxis DTR1 tyres that we supply are Tubeless Tyres (TL). Inner tubes are always required when using 19" Maxxis DTR1 tyres, regardless of wheel type. Despite being Tubeless Tyres, inner tubes may still be used if / when fitting 17" Maxxis DTR1 tyres on to conventional i.e.not tubeless wheel types.

We don't sell inner tubes, simply because they have always been cheaply and readily available elsewhere. Technically speaking, the specific rim width being used and therefore the resultant tyre width, could be a factor when choosing inner tubes. However, MotoX or Enduro 19" inner tubes, usually multi-size inner tube types that include 3.50 x 19 and 4.10 x 19 sizes or their metric equivalents, have always been the most popular choice by our 19" Maxxis DTR1 UK customers & our sponsored riders (that race Flat Track in the UK) use these inner tubes too. If / when having to use inner tubes with the tubeless 17" Maxxis DTR1 tyres because of the choice of wheel type, then conventional 17" Front Supermoto inner tubes are also cheaply and readily available elsewhere.

17" Maxxis DTR1 Tyres - Same Tyre Fronts And Rear?

The 120/17 x 17 DTR1 tyre can and regularly is, used on both front and rear wheels. This is due to the manufacturer's design intent being slightly different, than the 19" DTR1 tyres...

19" Maxxis DTR1 Tyres - Swap Fronts And Rears?

Using a 130/80 x 19 front DTR1 tyre and a 140/80 x 19 rear DTR1 tyre is a sensible way to go for a true Flat Track 'image' and the right level of 'feel' when riding. However, it's quite possible to run two Front DTR1 tyres OR two Rear DTR1 tyres on the same bike (subject to careful rim size selection) when clearance space is tight or, it's simply been the owner's own style choice. We've seen this selection, many times on both race & road bikes, with no detrimental effects as a result

19" Maxxis DTR1 - Which Compound For Road Bikes?

All the Flat Track tyres we stock and their different compounds, are primarily designed for racing. However, you can still successfully use either compound for road use. Your choice being based on; where you live, your mileage requirements, temperature variables and local road construction details plus, the specific bike they are going on and what you intend using it for! Our own usual advice, is to use matched compounds i.e. CD5 (Medium) for both front and rear tyres or CD3 (Soft) for both front and rear tyres. However, proving that variety works and is popular, when & where we have provided 19" Maxxis DTR1 tyres as part of an OEM supply chain, some manufacturers (based on the results of their own detailed, testing schedules) have made their own choice of compounds. For example; CCM Motorcycles chose Maxxis DTR1 tyres as the OEM fitment for many bikes within their very popular Spitfire range. In all those cases, CCM Motorcycles specified CD3 Front tyres and CD5 Rear tyres for OEM supply. Regardless of compound choice, the usual road-use tyre wear ratios normally apply; '...two rears to one front' etc. So far, it's the CD5 compound that is proving slightly more popular, with all of the road bike owners that we have supplied to date

19" Maxxis DTR1 - Road Legal Status?

All Maxxis DTR1 tyres supplied by us are 100% ECE Road Legal as clearly shown within the Specification Tab for each tyre (example DTR1 CD3 Front Tyre Specification Tab can be seen here) You will find the ECE-R75 Mark on the sidewall of every DTR1 tyre we supply. You can ignore any 'For Racing Use Only' type wording that may be shown on some stickers that come with any new DTR1 tyres supplied by us. Those stickers are generic and are only relevant to Non-ECE tyre rule countries (e.g. USA). The tyre's sidewall marking is the true indicator

17" & 19" Maxxis DTR1 - Racing Tyre Cuts?

The images below show some of the types of tyre cuts that can be used, to get the best performance on UK Flat Track race tracks (which are normally speedway tracks). Cuts for tyres for use on some European Flat Track race tracks may be quite different than shown here and cuts (if any) for tyres used on Flat Track race tracks in the USA, will definitely be different!

AAA Racing | AC Racing | Front Tyre Cuts

Here's examples of front tyre centre & side blocks cuts (just on one side) made using a normal tyre cutter... These images feature a 19" DTR1 Tyre

AAA Racing | AC Racing | Rear Tyre Cuts

Above are examples of centre and side block cuts on both sides of the rear tyre. These images feature a 19" DTR1 Tyre. As well as the normal block cuts, you can see additional very fine cuts, which are also directional (if you look closely!) These detailed cuts were made using a normal tyre cutter, a stanley knife and lots of patience...

AAA Racing | Maxxis DTR1 | Rear Tyre Cuts

At real Flat Track race meetings, there's far less time, but Maxxis DTR1 tyres can still be cut, either when taken off the bike or, whilst still on it!

AAA Racing | Maxxis DTR1 AAA Racing | Maxxis DTR1 Specifications

Remember that Description, Specification, Rotation Image and Fitted Image tabs are shown on the detail page of all the Flat Track tyres that we sell