# Extra wide internal width question **URL:** \ **Category:** Equipment\ **Created:** [September 1, 2024, 6:26pm UTC](https://www.trainerroad.com/forum/t/extra-wide-internal-width-question/95685 "2024-09-01T18:26:08Z")\ **Posts on this page:** 17\ **Page:** 1
**Author:** ![Peterreynolds](https://sea2.discourse-cdn.com/trainerroad/forum/user_avatar/www.trainerroad.com/peterreynolds/32/7725_2.png) [@Peterreynolds](https://www.trainerroad.com/forum/u/Peterreynolds)\ **Post date:** [September 1, 2024, 6:26pm UTC](https://www.trainerroad.com/forum/t/extra-wide-internal-width-question/95685/1 "2024-09-01T18:26:08Z")
Specifically the new Zipp 303xplr wheelset, but what (if any) are the downfalls/dangers of using a tyre that isn’t rated upto the 32mm internal width? Conti race kings have a maximum internal rim width rating of 30.5mm (only found that out last week) and obviously the wheelset is 32mm. I am fully aware that they aren’t on a compatibility list, but whats the “danger” of the mismatch of widths? Struggling to justify the wheelset when they don’t fit the fastest tyres! Cheers all for any insight ---
**Author:** ![AlphaDogCycling](https://sea2.discourse-cdn.com/trainerroad/forum/user_avatar/www.trainerroad.com/alphadogcycling/32/13863_2.png) [@AlphaDogCycling](https://www.trainerroad.com/forum/u/AlphaDogCycling)\ **Post date:** [September 1, 2024, 9:55pm UTC](https://www.trainerroad.com/forum/t/extra-wide-internal-width-question/95685/2 "2024-09-01T21:55:43Z")
> [@Peterreynolds](#): > > whats the “danger” of the mismatch of widths Worse case you could burp the tire or the tire could come off the rim during hard cornering. ---
**Author:** ![Peterreynolds](https://sea2.discourse-cdn.com/trainerroad/forum/user_avatar/www.trainerroad.com/peterreynolds/32/7725_2.png) [@Peterreynolds](https://www.trainerroad.com/forum/u/Peterreynolds)\ **Post date:** [September 2, 2024, 6:30am UTC](https://www.trainerroad.com/forum/t/extra-wide-internal-width-question/95685/3 "2024-09-02T06:30:00Z")
Fair one, In my non-tech mind I could see that being the case for the rim internal being too narrow (effectively folding the tyre as it deforms) but didn’t think of it as an option for wider rims Cheers ---
**Author:** ![OreoCookie](https://sea2.discourse-cdn.com/trainerroad/forum/user_avatar/www.trainerroad.com/oreocookie/32/8298_2.png) [@OreoCookie](https://www.trainerroad.com/forum/u/OreoCookie)\ **Post date:** [September 2, 2024, 6:31am UTC](https://www.trainerroad.com/forum/t/extra-wide-internal-width-question/95685/4 "2024-09-02T06:31:14Z")
> [@Peterreynolds](#): > > I am fully aware that they aren’t on a compatibility list, but whats the “danger” of the mismatch of widths? Just don’t and stick to supported tires. The Zipp wheelset is also _hookless_, so you have a second reason to stick to a supported tire. ---
**Author:** ![Peterreynolds](https://sea2.discourse-cdn.com/trainerroad/forum/user_avatar/www.trainerroad.com/peterreynolds/32/7725_2.png) [@Peterreynolds](https://www.trainerroad.com/forum/u/Peterreynolds)\ **Post date:** [September 2, 2024, 8:29am UTC](https://www.trainerroad.com/forum/t/extra-wide-internal-width-question/95685/5 "2024-09-02T08:29:44Z")
True, as much as I’m a magpie and enjoy shiny things, I won’t. Pinky promise ---
**Author:** ![Dubadai](https://sea2.discourse-cdn.com/trainerroad/forum/user_avatar/www.trainerroad.com/dubadai/32/82683_2.png) [@Dubadai](https://www.trainerroad.com/forum/u/Dubadai)\ **Post date:** [September 2, 2024, 10:41am UTC](https://www.trainerroad.com/forum/t/extra-wide-internal-width-question/95685/6 "2024-09-02T10:41:41Z")
This is the whole issue with the new wheels, it pretty much forces you to use their tyres as well. Personally, not worth the PITA and “locked down” system. ---
**Author:** ![Erik\_Wahlstrom](https://sea2.discourse-cdn.com/trainerroad/forum/user_avatar/www.trainerroad.com/erik_wahlstrom/32/67804_2.png) [@Erik\_Wahlstrom](https://www.trainerroad.com/forum/u/Erik_Wahlstrom)\ **Post date:** [September 2, 2024, 5:06pm UTC](https://www.trainerroad.com/forum/t/extra-wide-internal-width-question/95685/7 "2024-09-02T17:06:54Z")
These types of questions annoy me. You are fishing for someone to say “it’s fine, go ahead and ignore the recommendations”. You know the risks, but you can quantify them. Nobody can. So why even ask? ---
**Author:** ![Peterreynolds](https://sea2.discourse-cdn.com/trainerroad/forum/user_avatar/www.trainerroad.com/peterreynolds/32/7725_2.png) [@Peterreynolds](https://www.trainerroad.com/forum/u/Peterreynolds)\ **Post date:** [September 2, 2024, 6:14pm UTC](https://www.trainerroad.com/forum/t/extra-wide-internal-width-question/95685/8 "2024-09-02T18:14:40Z")
I wouldn’t say I’m fishing. it’s finding a rationale between why a 40mm tyre (their own xplr) is rated as ok even though it’s been reported to have had multiple documented punctures, and a mountain bike tyre on mountain bike width rims isn’t. ---
**Author:** ![AlphaDogCycling](https://sea2.discourse-cdn.com/trainerroad/forum/user_avatar/www.trainerroad.com/alphadogcycling/32/13863_2.png) [@AlphaDogCycling](https://www.trainerroad.com/forum/u/AlphaDogCycling)\ **Post date:** [September 3, 2024, 1:44am UTC](https://www.trainerroad.com/forum/t/extra-wide-internal-width-question/95685/9 "2024-09-03T01:44:45Z")
That’s easy: it’s what Zipp has spent $$$$$ testing and found, by whatever criteria they are using, to pass their testing protocol. It doesn’t mean that unlisted tires won’t work, it is only saying what tires Zipp says does work. ---
**Author:** ![Trix8806](https://sea2.discourse-cdn.com/trainerroad/forum/user_avatar/www.trainerroad.com/trix8806/32/155132_2.png) [@Trix8806](https://www.trainerroad.com/forum/u/Trix8806)\ **Post date:** [September 3, 2024, 1:57am UTC](https://www.trainerroad.com/forum/t/extra-wide-internal-width-question/95685/10 "2024-09-03T01:57:31Z")
I just ordered a new gravel bike building from the frame up. As cool and will “maybe” be the next best thing, too many unknowns and too many reviews with flat issues (tons of thread on the topic). I have no interest being a guinea pig yet. I ultimately landed on a set of Reserve 40/44 GR. They are 27 mm internal (wider than the standard zipp 303 FC) and also hooked with a fantastic warranty and reviews. They lack the “name recognition” of some other brands, but ultimately feel like the smartest choice until the XPLR is more proven. ---
**Author:** ![Peterreynolds](https://sea2.discourse-cdn.com/trainerroad/forum/user_avatar/www.trainerroad.com/peterreynolds/32/7725_2.png) [@Peterreynolds](https://www.trainerroad.com/forum/u/Peterreynolds)\ **Post date:** [September 3, 2024, 4:16am UTC](https://www.trainerroad.com/forum/t/extra-wide-internal-width-question/95685/11 "2024-09-03T04:16:51Z")
That’s kinda my point, in a round about way. The list isn’t saying about the “only” tyres that are compatible, it’s only saying about currently approved ---
**Author:** ![AJS914](https://avatars.discourse-cdn.com/v4/letter/a/919ad9/32.png) [@AJS914](https://www.trainerroad.com/forum/u/AJS914)\ **Post date:** [September 3, 2024, 4:31am UTC](https://www.trainerroad.com/forum/t/extra-wide-internal-width-question/95685/12 "2024-09-03T04:31:58Z")
They also say to stick to ETRTO guidelines. The tire you want to run is off by 1.5mm of internal rim width. Personally, I don’t think it’s a big deal. It’s still a 56mm tire on a 32mm inner width rim and strangely that fits with what Zipp says (min 40mm, max 60mm). But you take your own calculated risks and make your own decision. ---
**Author:** ![Pabst](https://sea2.discourse-cdn.com/trainerroad/forum/user_avatar/www.trainerroad.com/pabst/32/157934_2.png) [@Pabst](https://www.trainerroad.com/forum/u/Pabst)\ **Post date:** [September 3, 2024, 4:59am UTC](https://www.trainerroad.com/forum/t/extra-wide-internal-width-question/95685/13 "2024-09-03T04:59:43Z")
> [@AlphaDogCycling](#): > > it is only saying what tires Zipp says does work. Didn’t a large percentage of reviewers experience sidewall tearout on their “approved” tire from the sidewall wearing through due to rim contact? Maybe let Zipp figure out what they’re actually trying to achieve before diving headfirst in on this one… ---
**Author:** ![BCM](https://sea2.discourse-cdn.com/trainerroad/forum/user_avatar/www.trainerroad.com/bcm/32/137631_2.png) [@BCM](https://www.trainerroad.com/forum/u/BCM)\ **Post date:** [September 3, 2024, 1:13pm UTC](https://www.trainerroad.com/forum/t/extra-wide-internal-width-question/95685/14 "2024-09-03T13:13:48Z")
Lots of discussion here. Too many reported issues for me to jump on this wheelset. > [@Zipp 303 XPLR Wheelset](https://www.trainerroad.com/forum/t/zipp-303-xplr-wheelset/95127): > > So apparently I need to win the lottery … The SW version is similar to the Firecrest range with dimples and a lighter / higher-end hub (MSRP $2100USD). The S model has smooth walls and a 150g heavier hub (MSRP $1400USD). Initial BikeRumor reviewer had a lot of flats, but may have been a result of having tire pressure too low and/or tire selection. Plus the new 13-speed SRAM Red … ---
**Author:** ![Chain\_of\_Fools](https://sea2.discourse-cdn.com/trainerroad/forum/user_avatar/www.trainerroad.com/chain_of_fools/32/145672_2.png) [@Chain\_of\_Fools](https://www.trainerroad.com/forum/u/Chain_of_Fools)\ **Post date:** [September 3, 2024, 1:54pm UTC](https://www.trainerroad.com/forum/t/extra-wide-internal-width-question/95685/15 "2024-09-03T13:54:21Z")
3T, Nextie and Light Bicycle all make hooked 29-30mm wide aero rims. I have both 3T Discus and a set of LB WG44s, and both have been excellent and drama-free over 1000s of very rough miles. If you want wheels that perform similarly to the Zipps but for less money and with hooked rims, look at LB or Nextie. ---
**Author:** ![AlphaDogCycling](https://sea2.discourse-cdn.com/trainerroad/forum/user_avatar/www.trainerroad.com/alphadogcycling/32/13863_2.png) [@AlphaDogCycling](https://www.trainerroad.com/forum/u/AlphaDogCycling)\ **Post date:** [September 3, 2024, 3:31pm UTC](https://www.trainerroad.com/forum/t/extra-wide-internal-width-question/95685/16 "2024-09-03T15:31:59Z")
> [@Pabst](#): > > Didn’t a large percentage of reviewers experience sidewall tearout on their “approved” tire from the sidewall wearing through due to rim contact? Two things on the above: 1. There were definitely high-profile reviewers who experienced issues with the Zipp Xplr wheel set / tire combo they were provided. But I don’t know that we know what %%%% of reviewers this actually was. 2. All I can say is that Zipp approved the tire combinations, not that they should have approved them 🤣 ---
**Author:** ![AJS914](https://avatars.discourse-cdn.com/v4/letter/a/919ad9/32.png) [@AJS914](https://www.trainerroad.com/forum/u/AJS914)\ **Post date:** [September 3, 2024, 3:38pm UTC](https://www.trainerroad.com/forum/t/extra-wide-internal-width-question/95685/17 "2024-09-03T15:38:52Z")
I only watched one of those review videos and they got a ton of flats and cuts on the zipp tire, less on the other approved tire, and then normal performance on a non-approved tire they installed. It didn’t seem to be a rim issue like the rim was cutting the sidewall. It just seemed like a too delicate of a tire getting a lot of flats and sidewall cuts.