Nextie 40mm wide gravelrim! NXT45AGX

[warickwrx]

I've currently got a 40c thundero on the front and 44c on the back. With the hooked rim these measure 41.5mm and 45.5 @ 30 PSI. I notice a lot of white gravel rock marks on the sidewalls after every ride but at least where I ride the actual loose gravel is smooth so I've never had a sidewall issue. Any tire is going to have a more exposed sidewall on a rim this wide than it would on a thinner rim

Fitted the 44c versions and came close around 46mm. Seems like my Revolt frame still has some room if I want to go bigger. Now just to take them for a test ride !

[Pablojose87]

My AGX45 wheelset is used for road and fast gravel. My opinion is that this is the primary use case for this style of rim - to provide stability and an aero friendly profile when using wider tyres.

My preference for running a 36mm tyre is that on the AGX45 it will end up measuring about 40mm which lines up nicely with the rim. Going to the 40mm tire is likely to negate at least some of the benefit of running the AGX45 as the tyre will end up a lot wider than the rim.

Also note that the Speedero should be faster than the Thundero because the knobs are lower profile and more aero, something that BRR et all don't test for.

No manufacturer is ever going to suggest running a 36mm tire on a 41mm external rim. Ever. Especially offroad. There's no way they function properly, as you've found, and rim damage is practically a given at some point. Much wider? Thundero 40mm measures at 43mm for me. That's 4.9% wider, or 1.5mm / 2.45% each side. The 105% rule isn't really a rule, and it's pointless following it for these rims as they're nowhere near deep enough relative to their width for it to be relevant. This rim is about stability, and arguably reducing tire deformation with less mushrooming, leading to lower rolling resistance (and potentially an aero gain that way).

If you're worried about the minute aero gain between the Speedero and Thundero, then presumably you wouldn't be running these rims, as they're way too wide.

If you want mixed road and gravel use, and want aero gains, then you'd have been much better with the ARX49 from Nextie, or similar rims from FarSports or LightBicycle. The 36mm Challenge HTLR tires should be fine on 31-32mm wide rims, unlike these monsters.

IMO the Panaracer GK 38s (40 ETRTO) are too narrow for the AGX. Thundero 40s are the narrowest I'd ever go.

You can chose to ride what you comfortable with; however that doesn't make any some intrinsically unsafe because how you feel about it. I have the Light Bicycle WG44 with 30 internal width combined with a 35c graveking that measured 41mm. It seems you are mentioning the external width of the rim which how no impact on how safe or wide a tire will fit. I rode my setup on a 100 mile gravel race with no flats, no roll offs, no burping, and no crashing. The wheel/tire combo really shined on downhills where we would free wheel and I would coast ahead of others. This set up also allows for a lighter and smaller tire to perform at the same width and pressure of larger tires. Having a lighter tire is so helpful for climbing and acceleration over hours. Take it or leave it but it has been a great experience for me.

[wirelessness]

I'm wondering if I made a mistake ordeirng the AGX45 wheelset. I'm not sure I will benefit from the aero effect because I'm pretty sure after reading this whole thread I will likely want to run a bit wider tires than most people are using. I'm for sure going to ride a fiar but of rough fire roads with a lot of long steep segments (Mt Diablo) mostly with some mixed road and smooth fire roads when I am lucky. I definately want to run wide enough to not damge the rim. I'm also thinking maybe the AGX36 would have been a better choice for the kind of riding I do most of the time. Any guidance would be appreciated. Thanks.

[Tonsos]

I'm wondering if I made a mistake ordeirng the AGX45 wheelset. I'm not sure I will benefit from the aero effect because I'm pretty sure after reading this whole thread I will likely want to run a bit wider tires than most people are using. I'm for sure going to ride a fiar but of rough fire roads with a lot of long steep segments (Mt Diablo) mostly with some mixed road and smooth fire roads when I am lucky. I definately want to run wide enough to not damge the rim. I'm also thinking maybe the AGX36 would have been a better choice for the kind of riding I do most of the time. Any guidance would be appreciated. Thanks.

I am certainly of the belief that the AGX45 will work great with wider tires than the narrow options mentioned earlier in this thread. Even if I was running 40-45 mm (or wider) tires I would prefer the AGX45 rim width (inner and outer) to the "standard" 25 mm internal rim width of most other gravel wheels. Both in regards to aerodynamics, but also because you get less "mushrooming", more flexibility regarding tire pressure and the side wind stability that is mentioned earlier in the thread as well.

IMO the release of the new Zipp 303 XPLR wheelset is further proof/indication that the 45AGX is a really good, fast gravel wheelset. The 303 XPLR is described as groundbreaking and the ultimate high-speed gravel wheelset, in large part because of the "monumental" inner rim width of 32 mm. This surely is a big difference to the usual 25 mm inner rim width of most other gravel wheels, but it's really not that different from the AGX45(/36) or the 3T Discus 45/40. Of course there are use cases where a narrower and shallower rim would work better, but the AGX45 seems to me to be a really good choice for lots of types of rides/races.

Just like the 303 XPLR which has specifically designed Goodyear tires be aware that certain tires will not work very well with such a wide rim. Whether you have ordered hookles rims or not will also matter in regards to which types/widths of tires that will work best.

[CarlosFerreiro]

My takeaway from Dave Rome's review of the Zipp 303 XPLR on Escape was that the sweetspot in tyre pressure had become so narrow with the wider internal rim width that there that there almost wasn't a sweetspot left, and you were just chosing which compromise to live with. How are folk riding wider rims finding that to live with?

[wirelessness]

I'm wondering what people think the max tire size you can run without completely negating the bulk of the aero effect?

I'd love to read that review but it's behind a paywall.

[eins4eins]

offroad, i wouldn't choose a tire based on optimal width for the rim. Run the tire you'll think is optimal for grip, damping, puncture protection. Even if its too wide, it will still be more aero on wide, deep rims than on narrow, shallow rims.

[emotive]

I'm wondering what people think the max tire size you can run without completely negating the bulk of the aero effect?

I'd love to read that review but it's behind a paywall.

Previously, I would have said 45mm. I used to think once you get to a 2.0” or a 2.2” the air is not going to reattach to the rim, so you may as well have a shallow MTB rim, but after Dylan’s wind tunnel testing with 40mm, 45mm, and a 2.2” tyre on a 32mm wide 60mm deep Reynolds rim, I think we have a lot to still learn about what is aerodynamically beneficial and what is not.

[wirelessness]

I'm wondering what people think the max tire size you can run without completely negating the bulk of the aero effect?

I'd love to read that review but it's behind a paywall.

Previously, I would have said 45mm. I used to think once you get to a 2.0” or a 2.2” the air is not going to reattach to the rim, so you may as well have a shallow MTB rim, but after Dylan’s wind tunnel testing with 40mm, 45mm, and a 2.2” tyre on a 32mm wide 60mm deep Reynolds rim, I think we have a lot to still learn about what is aerodynamically beneficial and what is not.

I didn't find the wind tunnel testing on that rim with tires wider than 45mm. After reading so many reports of punctures on 40/45mm tires I'm having serious reservations about using these wheels with the size that the manufactuers of these and similar rims like ZIPP XPLR 303, and LB WG44. I'm not ever planning to race but would like to know my setup is fairly optimized.

[emotive]

I'm wondering what people think the max tire size you can run without completely negating the bulk of the aero effect?

I'd love to read that review but it's behind a paywall.

Previously, I would have said 45mm. I used to think once you get to a 2.0” or a 2.2” the air is not going to reattach to the rim, so you may as well have a shallow MTB rim, but after Dylan’s wind tunnel testing with 40mm, 45mm, and a 2.2” tyre on a 32mm wide 60mm deep Reynolds rim, I think we have a lot to still learn about what is aerodynamically beneficial and what is not.

I didn't find the wind tunnel testing on that rim with tires wider than 45mm. After reading so many reports of punctures on 40/45mm tires I'm having serious reservations about using these wheels with the size that the manufactuers of these and similar rims like ZIPP XPLR 303, and LB WG44. I'm not ever planning to race but would like to know my setup is fairly optimized.

If you have a rocky route, like Unbound, you also need to optimize for punctures. Go for a bigger tyre with a high sidewall protection rating on BRR.

If you have champagne gravel, and even a percentage of sealed roads, then you need less puncture protection, and less suspension from the tyres. You can choose to optimize for aero with a fast tyre and a width close to the rim width.

Here is the test I mentioned https://youtu.be/w3yspNTvVPo?si=ywirHx-Ax7oGdvf_

[Petz]

Just built up my new wheelset with AGX45 rims and mounted some Schwalbe Pro ones in 32mm (front) and 34mm (rear) on it.
The 32mm seems like a perfect fit for this rim. The new tire measures exactly 35mm, while the rim is 36mm wide.
The 34mm tire (already used for around 2k km) measures 37mm. Can't wait to try them.

Here's a picture of the 32mm tire:

[emotive]

The 3T discus 45|40 wheelset was the only mid depth wheel to outperform the new Hunt limitless gravel aero wheels in the wind tunnel.

They tested with Schwalbe G-one in 40mm and 45mm sizes.

https://www.cyclingnews.com/news/hunt-4 ... on-spokes/

[Achase6002]

I mounted up some 35mm Barlow pass el and they blew off the bead around 60-70psi

I was just pumping them up to make sure the bead was fully seated. I don't plan to run them at 60 or 70psi. so do u think they are good to reseat and run at 30-40psi?

[svennn]

I have a set of the NXT45AGX hooked. I believe they are 29mm id and 40mm exterior width.

I mounted a set of GP5000 AS in 35mm and they measure 39mm @ 40PSI. I love them. I'm mostly on road but have ridden them in one gravel event so far. I had no issues with 27psi on gravel. They replaced the stock aluminum wheels with Panaracer slicks. The Nextie wheels roll faster for sure. Pure actidote, but my max speeds on downhills that I have ridden for years is consistently higher while coasting.

I'd buy them again. One thing was that those tires are harder to get on the rim than anything I have tried in 27 years of cycling. I've taken pride in being able to change tires without tools. It will never happen with these. I'll be interested to see how they come off after a season on the wheels.

[Bikera]

I mounted up some 35mm Barlow pass el and they blew off the bead around 60-70psi

I was just pumping them up to make sure the bead was fully seated. I don't plan to run them at 60 or 70psi. so do u think they are good to reseat and run at 30-40psi?

I wouldn't and I'm not particularly conservative about these matters (i.e., I've been using wide hookless rims for a long time and have often tried running smallish tires on 'em without any negative results when using 60#-ish to seat them or while riding).

For me what you experienced would be a bad omen. When inflated to 30-40# the forces on a tire bead while riding could easily result in what the static 60-70# did. For those tires RH recommends a max. 27mm rim I.W. & max pressure of 60# tubeless and from what you experienced it sounds like there's no safety factor built into those limits especially if used on hookless rims. Which leads to this BTW: can I assume your rims are hookless (i.e., I wouldn't expect that behavior from hooked rims despite the fact that RH shows the same rim width & pressure limits for hooked vs. hookless rims, which of course defies common sense esp. since Nextie's limits are much more liberal for their hooked vs. hookless versions)?

Either way I'd go bigger or try a different brand if you really want to stick with a small-ish tire on wide rim combo.