I have a 2021 Madone SLR7. I currently have the original Bontrager tires with over 4k miles on them. It might be getting close to time to change them.
They are 28's by Bontrager, the R3.
It seems they don't make a 30mm.

I'm thinking of putting on 30mm Conti 5000's.
I am 60, I ride because I enjoy it, I have never raced and never will.
Any drawback to putting on the 30's?

Thanks

As long as there is enough clearance, I see no downside to going to 30mm and GP5K tires are good.

I believe 32 will fit, but I'll start with 30.

Thank you for the input.

If you're just curious about the quality differences between the two models, this might give you an idea of what to expect apart from the size difference.

If you have a tubeless ready rim, I would be going to a Conti GP 5000 S TR tubeless tire. I did this almost right away when I purchased an SL 7 Emonda in April. A great move, on a 28mm tire that measures 30mm, can run 70/80 psi and it’s a wonderfully comfortable ride, as well I have had one puncture from a piece of wire that needed pliers to remove, the hole sealed itself with no further issues. I’m sold on tubeless, even for road bikes when I was on the fence prior.

Thanks, I am not considering tubeless at this time. Happily, I have not had a flat in several years, and that was an inch long gash in the tire.

I have the standard tube version 5000 on my older road bike, it’s a rock solid tire and very comfortable ride. There’s a reason it is often recommenced

I'm a big fan of GP 5000 S TR tubeless. I'd go with the widest tire you can fit. Of course make sure it is appropriate for your rim width.

If that's a 32, go for it. I recently put on 32 mm after wearing out my 28's on my Domane. It's every bit as fast as it was on the 28's and maybe even faster. I'm riding at 18-20 MPH. If I were able to ride significantly faster, maybe the aero losses of the 32 mm being wider would hurt. But at this point, I plan to stick with 32 mm from here on out.

Just going from the Bontrager R3 to GP 5000 tubed, you're still likely looking at 10 W or more of savings. That's a huge difference. The GP 5000 are arguably the best road tire out there. I'm not sure there is a good Bontrager tire.

Depending how fast you ride, you might expect ~0.5 MPH increase in speed with the same effort.

The GP 5000's are more expensive. But you took ~3 years to put on 4k miles, so you're going to get years out of them and the cost per year is pretty low. My experience with the GP 5000 S TR is they wear VERY well, are as good or better at puncture protection then other tires I've used. They DO NOT wear fast and they DO NOT puncture easily. Are there tires that wear less or have more puncture protection? I'm sure there are, but the GP 5000's are very good in this regard. They are not a fragile or delicate tire.

Definitely long lasting. I suffered a tread cut from a piece of glass on my rear GP5k at around ~800 miles. The glass didn’t cut the carcass, so I decided to keep riding on the tire. I check the cut every few rides to make sure it hasn’t grown or changed, and I happen to notice the wear dots on the tire at the same time. The tire is now nearing 2,400 miles, and while the cut is still there, the tire carcass still looks fine. More impressively, I can still see the wear dots. I’m about 90kg, so it’s not like I’m light on this tire, either!

I ordered three GP 5000 S TR.
Thanks all for the advice.

That’s the tubeless model I believe. Can you change to the tubed? The tubed ones are usually about 10 bucks cheaper, too.

The GP5000 is a must choice, you will be delighted with their performance.

I thought the TR was tubeless "ready"?

Crap, I'll call later today and talk wo them.

you can run tubes in Tubeless Ready tires. However if you are not wanting tubeless ready, you can check out the Pirelli P Zero Road tubed version, they are nice tires and have very good protection from flats

The GP5000 S TR can be run with tubes fine.

Correct. That said, if he can switch to the tubed model I think that would be lighter and possibly better.

You are correct, it is.
The tubed version is typically less expensive, is a touch lighter, and is easier to install/remove.

Just installed a set on my new wheels. I went with 25F and 28R. Did have to use the Kool Stop Bead Jack tool to get the last bit of bead over. New wheels are tubeless ready but I am sticking with tubes for now.

Er um

Pirelli PZero Race clinchers
Spesh Turbo Cottons
among others

and you can easily repair a flat roadside with out tools.
.

You can with the GP5000S TR too on many rims. I have installed several of these on my DT Swiss ERC rims without any tools. I do run them tubeless.

I believe the previous generation of GP5000 TL was a much tighter fit. I never ran these personally, but I’ve read this from many different sources.