djnotts wrote:Mavic used to "worry" a lot more about rim widths and tyre size before mtb rims on which folk mounted a much wider range of tyre sizes on just one size/width rims. Then lo and behold they didn't. I've often mounted over or under sized tyres on rims with no problems.
It was the Mavic website I found the info regarding what tyre widths for what rim widths.
suggests that a load on one wheel of 55kg ought to require that the tyre is inflated to 130psi, if it is a 23mm one.
FWIW one of the concerns about skinny tyres on wide rims is that the rim is much more likely to be damaged.
cheers
I’m somewhere between 133 and 139kg.
How do I find out the pressure limit for the rims?
The tyres max pressure is 80psi.
80psi in a 23mm tyre is enough for a very light load. You need different tyres to that, and they might as well be slightly wider ones.
cheers
In that case, I’m just going to sell the tyres and return the Portland Design mud guards for a refund. I had hoped to run these tyres on my summer bike and use the Schwalbe Marathon 32C tyres that are currently on it on the tourer that I’m building.
EDIT: I only have these 23C tyres as they were on the RX31 wheels that I bought on eBay. The wheels are destined for my winter ride whose 32H Alex Rims are going on the tourer.
I think getting guards that can take a bigger tyre than 23c is a very good idea anyway (assuming your frame is ok with them), even if you keep these (and I thinking going to something wider would make sense). 23c is pretty skinny these days and there are some very nice wider tyres available.
I think getting guards that can take a bigger tyre than 23c is a very good idea anyway (assuming your frame is ok with them), even if you keep these (and I thinking going to something wider would make sense). 23c is pretty skinny these days and there are some very nice wider tyres available.
Yeah, I’m 21/22 stone so I’d pushing that weight limit. I only wanted to use them as I have them. And also to save some money on the tourer build. As I was going to be using them the only guards I could find that were suitable for a 23c tyre were Portland Design Works guards at £75 :-O They are lovely guards though and I think they would be stunning on my Titanium Croix De Fer, and, they do a wider version
I’ll buy some touring specific tyres for the tourer, keep the Schwalbe marathon 32C’s on the Titanium bike and buy the wider PDW guards as a treat for it. I’ll return the guards I have and sell the 23C Duranos.
I have been looking at some rims which are H + sons hydra and are 25mm wide and 20 to 21 internal width. According to charts on the net I have found they would be for nothing narrower than 32mm. However they are described as optimised for 25mm to 28mm. Interested to hear views on why this is.
FatLad1980 wrote:Yeah, I’m 21/22 stone so I’d pushing that weight limit. I only wanted to use them as I have them. And also to save some money on the tourer build. As I was going to be using them the only guards I could find that were suitable for a 23c tyre were Portland Design Works guards at £75 :-O They are lovely guards though and I think they would be stunning on my Titanium Croix De Fer, and, they do a wider version
I’ll buy some touring specific tyres for the tourer, keep the Schwalbe marathon 32C’s on the Titanium bike and buy the wider PDW guards as a treat for it. I’ll return the guards I have and sell the 23C Duranos.
I have a clubmate that has those guards they are very, very nice. A Ti CdF will look pretty good with them I reckon!
rickd wrote:I have been looking at some rims which are H + sons hydra and are 25mm wide and 20 to 21 internal width. According to charts on the net I have found they would be for nothing narrower than 32mm. However they are described as optimised for 25mm to 28mm. Interested to hear views on why this is.
it is probably because the chats on the net are ETRTO ones and (as Schwalbe point out on their website) those fitments are a little behind what is possible. They are also conservative in nature. That the 25mm wide rim will accept a 25mm tyre is the same logic as allows a 23mm tyre to fit onto archetypes and similar.
The tyre manufacturers are by and large not so keen, and there are similar issues as discussed above. Probably the tyre manufacturers won't warrant their product if it is installed on a rim outside of their recommended range, regardless of what the rim manufacturers say.
Thanks for the explanation. I can understand the tyres might be fine with the wider rim but the term "optimised" suggests this is the best size tyre for the rim. Most likely marketing....
I always felt the roadies of the cycling world were on a hiding to nothing with their insistence on 23mm or even narrower tyres, that somewhat wider tyres in fact rolled no slower, but were more comfortable, more reliable and preferable in every way - apart from not fitting the painfully close clearances to which so many road frames had been constructed for decades, out of nothing better than habit and an unquestioning love of Campagnolo, who stubbornly refused to make a brake with more than 49mm reach!
My only regret is that by the time the speed merchants discovered the error of their ways and came around to my way of thinking, I was no longer in a position to put I TOLD YOU SO in print!
Chris Juden One lady owner, never raced or jumped.
I’m now home after being away for Christmas and, ooops, my bad. They’re actually 28c.
In my defence, the writing is tiny and on one of the tyres it looks very much like a 3 rather than an 8 (dodgy mould?) and it’s probably that one that I looked at.
rickd wrote:I have been looking at some rims which are H + sons hydra and are 25mm wide and 20 to 21 internal width. According to charts on the net I have found they would be for nothing narrower than 32mm. However they are described as optimised for 25mm to 28mm. Interested to hear views on why this is.
