Tire help

I need a little help figuring out what I can do here. I have a UDC 29 trainer
I am happy with it as it does what I need at this time but as I move to riding more easy off road type trails I feel I want to replace the stock street tire with a slightly more aggressive tire that can handle the terrain better. I don’t think I’ll ever go full muni but I do like the bike trails
anyway the tire size that is on it is 28 x 1 5/8 x 1 3/4 , 700x45C
will a standard 29" tire fit. I would like to go to a 29x 2.25 if I could or even just a 29x2 would work. I just want it to be better in dirt and handle rough ground better

looks like after doing some more research the 28 and 29 are not the same which is what I thought. looks like I have a couple choices for a more aggressive tire. I had thought as I bought this uni and it is called a 29 trainer that it had a 29" wheel on it not a 28.
so new question of my limited choices what would be a good hybrid tire for both street and light trail riding

Not sure it will help you, but Sheldon Brown’s page here https://www.sheldonbrown.com/tire-sizing.html has some good information on tire sizes. The ISO numbers would help but nobody seems to use them.

hmm that makes it look like a 29 tire will fit in the place of my 28 x 1 5/8 x 1 3/4 tire, both are 622 700C
so I guess my original question still stands :thinking:

Yeah, the 622 is the real number you need to worry about. They really f’d up when they started naming these tires size-wise, talk about confusing.

How much riding paved vs dirt do you think you will do? That’s the important part to answer.

I’m running a schwalbe big apple 2.35 on my 29er lately and really like it, it’s light and has a good volume to it, also has a good shape for making road crown less of an issue. It doesn’t have much knobbies if at all, but people have said it actually does ok on dirt which sounds right to me. So if you are around 75% road vs 25% dirt or there abouts, it would probably suit you very well.

On my gravel bike I have schwalbe smart sams (they come in 29x2.1) I love them on my bike but am not sure how they would be on a uni. They have small knobbies in the center, bigger ones on the outside (that is what worries me about them not being so great on a uni). Also a light tire, rolls great on pavement, has good offroad grip.

I hope this helps at least a little, tires are a complex issue in this sport.

yes that helps a lot. right now I’m riding mostly on paved or sidewalk type bike paths but the newest place I am riding is a nice 3 mile loop that is 70% sidewalk and 30% hard pack dirt and gravel. if it been raining it can get a little slick in places.

another question in regards to this
what does it mean when they say foldable tire :thinking:
I really like the tires that are on my mountain bike because it has very small knobby design and looks like a good width so I was looking to get one like it for the uni but it says it’s a foldable tire and I don’t know what that means and or if it would be OK on the uni
it’s this tire https://www.amazon.com/Iron-Horse-Foldable-Mountain-Bike/dp/B00ELXHLAY/ref=sr_1_11?hvadid=78477694993606&hvbmt=be&hvdev=c&hvqmt=e&keywords=29+bicycle+tire&qid=1564068696&s=gateway&sr=8-11

Foldable means that you can “fold” or roll the tire into a smaller shape usually for the purpose of carrying it with you as a spare. Traditional tires have a wire bead that makes them difficult to fold into a small shape. You can do a sort of round twist of a road bike tire to get it to a smaller shape. I’m not sure if you can do that with a mountain bike tire or not.

The Amazon reviews seem to indicate some issues with the bead on that foldable tire. I’d be tempted to find a standard tire with a wire bead instead unless you plan to carry this tire as a spare. But you can never trust the Amazon reviews and perhaps those tires are just fine.

Foldable = kevlar bead, non foldable = wire bead

foldable tires are usually lighter, often times they have a lighter casing and a higher performance grip compound.

Sometimes we don’t want the lighter casing, we want durable thick sidewalls to keep our tires from folding over.

The kevlar bead also tends to stretch over time, a good thing if the tire is hard to get on your rim, a bad thing if at first the tire is easy to get on the rim. Each rim/tire combination is always a little different.

When the tire is shipped to you the foldable comes in a small pouch, the nonfoldable comes in a big box.

that makes perfect sense, thanks for the explanation
I think I’ll go with a wire bead tire