Schwalbe tyres too big for rims

[velorog]

Last year I built a pair of 700c wheels using some old NOS Rigida rims. When it came to fit the 28mm Marathons there was no way I could get them to seat properly as they seemed oversize for the rim even though they had previously been fitted to some Mavic rims. Abandoning the Marathons I succeeded in fitting some 32mm Continental TTs. Now the rims were quite narrow for a 28 tyre so I was surprised when the TTs fitted. As a result I assumed that the Rigida rim and Marathon tyre may have been at the extreme limits of their manufacturing tolerances giving rise to too much clearance.

Last night I took a call from a friend who was trying to fit a new 25mm Marathon Plus to a Mavic rim as a replacement for a non + 25mm Marathon. He was having the same problem - the tyre kept popping off the rim. Now he is an experienced cyclist and has previously fitted M+'s with no problems.

Have other members of the forum experienced similar problems or are Schwalbe having problems with their manufacturing tolerances.

[reohn2]

I always find Schwalbe tyres an easy fit and can get them on and off without levers usually,but I've never had a problem with them not seating properly.
I've used them on DRC STouring,and ST19's,Mavic Module 4,MA2 and MA3's,519,719,227,217,Alex DH19 and D25's,Sunn Rhynos,Rigida Sputniks,Vuelta and some others.
Continental Gatorskins are tight on anything I've fitted them on.

[Brucey]

Continental Gatorskins are tight on anything I've fitted them on.

yeah... just as well they don't puncture that often I guess... The last set I fitted wouldn't even 'seat ' properly until they were inflated to over 80psi.

Re the loose tyres;

I think Rigida have had some QC issues that left some rims the wrong size but that was a while ago.

Stupid question; you are absolutely sure that you are not trying to fit a -630 tyre to a -622 rim?

If not, sometimes when using a rim with a curved, shallow well, it helps to build up the rim tape to a greater thickness.

cheers

[Erudin]

Try Hermanns rim tape.

[rjb]

I had the same problem with a marathon hs308 28 or 32 from memory. It had been fitted on a rigida rim for about 1000 miles when it suddenly popped off. I could not get it to reseat on any rim i had. Other tyres fitted the rim without problem. I put it down to a failed bead on the tyre although there was no obvious visible defect. I eventually binned it.

[velorog]

In both instances it has been possible to get the tyre to 'fit'. But after inflating and leaving overnight the tyre has popped. I doubt if the tyre were the wrong size my pal would not have even got this far. I will suggest that he tries two rim tapes or a thicker one.

[Brucey]

maybe rjb is on to something with the idea of failed bead. This is something I have occasionally seen on tyres that were rather tight on a rim start with and needed a fair amount of persuasion. The persuasion causes the bead to fail and after that the tyre is no good.

If you suspect a failed bead, you may be able to feel it; any place the bead seems more flexible than normal may be where the bead has actually failed.

cheers

[Ambler]

I had the same problem with one of 2 landcruisers recently.
Sent it back to Wiggle and the replacement was fine.

[mrjemm]

Aha... Schwalbe are at it again! Hehehe.

Note my post a few weeks ago- viewtopic.php?f=5&t=69261

Put my marathons (originals? Can't remember) on though, and they're fine, as were the CX Comps I had pop off my bike, when they were on my partner's old bike. I think I'd actually originally had them on my bike when I had ZTR rims, and don't recall issues either, but they were tubeless ready, so perhaps built with tighter tolerances.

[breakwellmz]

Continental Gatorskins are tight on anything I've fitted them on.

yeah... just as well they don't puncture that often I guess... The last set I fitted wouldn't even 'seat ' properly until they were inflated to over 80psi.

Re the loose tyres;

I think Rigida have had some QC issues that left some rims the wrong size but that was a while ago.

Stupid question; you are absolutely sure that you are not trying to fit a -630 tyre to a -622 rim?

If not, sometimes when using a rim with a curved, shallow well, it helps to build up the rim tape to a greater thickness.

cheers

How does this help?

When fitting the last bit of a tyre,you push the opposite side into the well(on the opposite side of the wheel) where the diameter is smaller.
Surely having a thicker rim tape makes fitting a`tight`tyre,tighter?

[Brucey]

How does this help?

When fitting the last bit of a tyre,you push the opposite side into the well(on the opposite side of the wheel) where the diameter is smaller.
Surely having a thicker rim tape makes fitting a`tight`tyre,tighter?

my comment about the thicker rim tape was prefaced by; 'Re the loose tyres'...?

cheers

[breakwellmz]

Sorry,my mistake.

[ossie]

Interesting. Last year I purchased a pair of 28 mm Marathon 368's from Spa for a tour from Spain to the UK.

I assumed they would fit Mavic Open Pro rims....they didnt, they were far too big (thought they went on too easily) but I didnt find out until I rode away from the airport..I didnt get too far before the tube popped out and BANG, the same happened 30 miles later in the Pyrenees. Riding in the middle of nowhere with no tubes left on dodgy tyres isnt fun.

I was in no doubt that the tyres were useless however a Spanish bike shop owner assured me new rim tape would cure the problem. I got him to double layer it. It got me about 600 miles then another tube went. Then another back in the UK.

There is clearly a issue, I have binned them and replaced them with Vittoria Randonneurs which were tight going on and have stayed on.

[regoak]

I have one bike with rigida chrina rims. I run 23mm tyres on that bike and at one stage fitted schwalbe Luganos (now discontinued) and the beads wouldnt sit in the rims at all. I did though have a problem with a michelin folding tyre popping off after it had seated OK in fitting.
In view of the latter, I wonder if as mentioned upthread it is a rim problem and not the tyres.

[MLJ]

I have been using 700x32 Schwalbe Marathons for many years, and have just fitted a new set. I did notice that these are much looser than previous tyres! I will not need levers to remove them when stretched in use. The rims have deep flanges so I do not foresee them coming off. I do not see than thicker rim tape will make for a tighter fit, as it is likely to just lift the tube further away from the well.