If you fill through the valve stem, don’t use Stan’s Race Sealant as it can plug things up. I’ve also found Orange Seal will do this but to a lesser degree.
This will prevent this but haven’t tried with Stan’s Race Sealant.
This. I question the rational behind getting such a tire on the rim finally after every trick in the book if it involves things you only have access to at home or are expected to do on a workbench while taking your time and an array of tools. You never will be able to do any roadside repair if the sealant or even some “salami” type insert doesn’t help you. Might as well going the whole way and glue tubulars. Don’t laugh - you get them easier on and while you can’t really replace them road side either you have an even better chance to stay on your bike should a sudden flat happen.
Best way would of course be to find another tire / rim combo if one absolutely needs one or some of the perks of tubeless (mostly offroad) or stay with innertubes (mostly for road) until the industry made some more progress in the field of tubeless (getting better all the time but quite obviously still not there yet).
I also have one of those sealant injector tools. Works great. Highly recommended!
I honestly think that most people don’t properly jam the tire into the center channel of their rim as well as they could during installation. And you definitely need lubrication (soapy water). A new tire is sticky and it will grip the rim rather than sliding into the channel making it easier for you. Letting a new tire sit in the sun is the icing on the cake.
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One factor that hasn’t been mentioned in this thread is the choice or method of tubeless tape, I have heard that thinner varieties will make for easier installation than thicker varieties (or multiple layers of tape around multiple times). This is likely to be fractions of a millimetre in the effective diameter of the rim channel but tolerances are so tight it could be the difference.
I haven’t experimented extensively myself but this seems like a reasonable assumption, I know I have had good experiences fitting to Hunt rims using the preinstalled Hunt tape, but had real difficulties on older Bontrager rims with their (probably thicker) rim strip method.
I have the same struggle, gp5000 tl with Bontrager aeolus 5, extremely tight, I will try my lack later because my fingers need a rest day. I am trying to put the bead into the channel but how to do it when the already seated bead it in there and is so hard do put it outside the middle channel. Even if one small part will jump out it comes back to place.
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Got then today, took tire leavers to put even 1 side on, same with the other, they actually seated quite nice with the floor pump. Excited to ride then tomorrow.
As much as I like to work on my bike, I failed today after 4h. I am not even close. I put them in the sun for 3 hours, It helped a bit but not enough. I will try to give them to the LBS.
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Tight fit… push the valve stem up, that will give you a little more room. I gave up on the 5000 TL - really believe the Specialized Turbo tires provide better grip and feel at similar rolling resistance.
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Somebody mentioned Bontrager TLR and yes, I remember the rim strip being about 1mm thick of plastic which really impacts the amount of channel you have to play with. Also it was hella soft and I managed to take a chunk out with a plastic tyre lever putting the tyre on. Had to pop the tyre back off and fill in the hole… That said, I managed to get the tyre on in the end. Had a really good run with them too, two sets of tyres over the course of a couple of years or so, trouble free!
I went to two bike shops and they both said impossible without damaging something haha. Well I guess all I have left is to sell these and go for Schwalbe
Schwalbe for any reason in particular? Bontrager’s TLR tyres have been pretty good to me and they should be a perfect fit for a Bontrager wheelset.
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I am thinking of 2020 Schwalbe versions, Read they are very easy to fit and have good ride characteristics. I also read mixed opinions about Bontrager tyres.
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I use te Pro One TLE 2020 for some weeks now. Really like them!
Can´t compare rolling resistance in an objective way, but seems comaparable to GP5000. Don´t seem that they last as long as GP5000, but the grip seems noticably higher than the Contis! I will use them for this season.
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I wonder if it’s the 23mm or 25mm that are particularly difficult, or maybe I’ve been lucky? I bought a set of November AR50 wheels that are 25.5mm internal and 31.5mm external. I was able to mount 28mm and 32mm GP5000s by hand each in under a minute. They both inflated with a floor pump too…no canister or compressor required.
The 28mm were 31.5mm on those rims, so I’ll be curious what the 32mm measures out too once they’ve settled in a bit. Should make for a comfy ride over the crappy local New England roads 
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Well, I mounted Schwalbe today by hand so I guess Bontrager And Conti are not big friends. Sealed with floor pump, packaging seams premium too.
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I can’t do it myself with GP5000s, and I don’t even try anymore. I’ve tried several times with no luck. I also can’t bring myself to go all in on the apparent force requirement. Before my tubeless days, I once broke off a whole section of carbon brake track on the wheel, rendering it useless, by using the multiple tire lever trick. The tire lever was plastic, too, so I’m not stoked with that rim’s durability anyway. Currently, I’m on Bontrager TLR 5s and Giant’s in-house tubeless Propel wheelset, and I take them all to my LBS to mount. if they break it then they’d replace it for me… They’ve told me each time that it takes 2-3 mechanics to get them mounted, but they have been capable every time so far.
Last time, I rode a grand total of 9 miles before THIS wound up in my tire, ruining the freshly mounted tire.
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I’m looking at my first attempt at mounting GP5k tomorrow… should be… fun.
FWIW, to the intent of the OP, I’ve read on numerous forums (and comments on retailer sites) about the GP5k and Mavic wheels effectively being incompatible. This doesn’t surprise me - as the hassle of mounting tires on my wife’s set of CC40 was enough for me to unload them. Seems like a pairing that’s asking for trouble.
Hi just to point out you do not need to unseat tyres to insert new sealant, can unscrew valve core and pour through. By the way have gave up me too (Mavic Ksyrium carbon ust) and opted for very good Performance 11 Storm
Definitely impossible to mount into Mavic Ksyrium Pro Carbon UST 2019 too (unless put huge effort I do not want to) Wondering how the hell is possible Continental haven’t tried mounting before put on the market, nevermind they will not have my money! Returned and ended up opting for very good Hutchinson Performance 11 Storm