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Looking at different tires from Trek, they have names like T2, R3, AW1, but I can't find anywhere that decodes these names and tells me the difference between one or the other.

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    What do you need the information for? Bontrager is a OEM house brand for Trek and if you're buying replacement tires, you're better off buying a dedicated tire brand. – ojs Sep 16 at 18:05
  • @ojs Bontrager actually make some very good tyres and their MTB tyres are very worthy for consideration when buying. The 120tpi 'Team Issue' casings are one of the best around – Andy P Sep 17 at 7:51
  • @AndyP I think it's more that Bontrager brand has some nice tires, but they are more or less relabeled products from other manufacturers. It might be that in the US the relabeled version distributed by Trek is a good deal, in Europe not so much. – ojs Sep 17 at 9:10
  • @ojs are you sure you aren't getting confused with another brand? Bontrager tyres have their own R&D, and at least in their MTB tyre line feature unique tread patterns, and superior casings to most other brands. Here in the UK (still part of Europe - for the moment), they are generally competitively priced and well thought of by anyone that tries them. – Andy P Sep 17 at 9:25
  • Here's an interesting read: bikerumor.com/2018/03/20/… – Andy P Sep 17 at 10:21
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They are indicators of what product line Trek is placing each tire in. For example, R=road, AW=all weather, t=Touring, XR=cross road (or something like that, indicating smaller tread that is not too big for mixed road riding) G=gravel and so on. I would say that these prefixes don't really mean much, just choose a tire that is appropriate for the type of riding you will be doing.

  • How would you choose a tire that's appropriate without being guided by the prefixes? Clearly they must mean something. – Weiwen Ng Sep 16 at 18:29
  • Take a look at these 3 links. All different prefixes, but to my eyes very similar. bit.ly/2lYnVo0 bit.ly/2kfxVZE bit.ly/2kP55zz (BTW, editing my original answer, it appears Trek uses the "T" to mean Touring, not Tread.) So, can you use a "Hybrid" tire for touring? Road riding? How about for "Gravel" riding? I think you will find a lot of crossover in these lines. – renesis Sep 16 at 18:57
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    Although the prefix means something, chances are the difference is much smaller than the marketing people will have us believe. – mattnz Sep 17 at 3:04
  • That is a fair point, but to my mind, there are some clear distinctions. There's clearly one group of mainly road tires, including the performance road and all weather ones. There's one group of hybrid bike and touring tires, and you could maybe lump the all weather tires in here also. The gravel and CX tires are pretty close in tread, and you can definitely use a gravel tire in a CX race, as well as vice versa. Those distinctions are clear. So, I guess I can discern some broad categories. – Weiwen Ng Sep 17 at 16:40
  • @Weiwen Ng, yeah, the broad categories and distinctions are there, I just wouldn't want people to think something like "I have a cross bike, so should get cx tires for it" even if they are primarily using it to commute on dry pavement. – renesis Sep 17 at 17:43
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I don't want to add links, since they will become broken eventually, but look at the Trek bicycle web site. (they own Bontrager) If you look through the tire section of the site, then filter for eg. road tires, and click on a specific tire, you'll see some specs on the tire, eg tpi, the weight etc

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