bike maintenance: unable to fir tyres onto rim

Everything about building wheels, glueing tubs, etc.
Posts: 36
Joined: Wed Oct 03, 2007 10:05 am

by raptor2003

wheels: zipp 303 clincher 2008

tyres: GP4000S

no matter how much I tried, the bead has like 10cm outside the rim and cannot be forced in

tyres are 25-622

I can fit those tyres on fulcrum rim 622-15 though

anybody know wassup with the zipp? what size are they?

how can I avoid this in future when buying tyres for zipp

TIA :)

by Weenie

User avatar
Posts: 5771
Joined: Tue Sep 26, 2006 12:37 am
Location: Phoenix Arizona

by CharlesM

It's snug, but I have used that exact combination...

There are a few wheel and tire combinations that are just a pain. Zipp build to a full 700 and the fitting is pretty close (and varies almost none as they have to fit carbon to the metal hoop). Conti build to the tight side...

Posts: 107
Joined: Sat Jun 23, 2007 5:40 pm

by mofo

You may want to try some talcum powder, or soapy water. I had the same problem with neutron ultras and conti tires.

Posts: 83
Joined: Sun Nov 02, 2008 11:23 am

by Ronnie-the-scot

Talc or var tyre levers (google them) they work a treat

User avatar
Posts: 8605
Joined: Wed Oct 31, 2007 10:32 pm
Location: Los Feliz, Los Angeles, California

by prendrefeu

and try really, really, really hard.
Exp001 || Other projects in the works.

User avatar
Posts: 3722
Joined: Thu Nov 04, 2004 10:56 pm
Location: Wichita, KS

by drjones96

yeah...I've had some that pretty much just fell onto the rim with no force......and alternatively I've had some tires that didn't seem like they were the right size because they took gorilla force to get them on. Even did a double check to make sure I wasn't trying to put a 650 on a 700. :lol:

Posts: 586
Joined: Mon Jan 02, 2006 7:10 pm

by ghisallo2003

Yes, there are some poor combinations out there, but with perseverance, sweat, swearing and tears, they generally do go on.

Which is ok if you are in your living room, but when it is -4C outside, and you are stuck by the side of the road, your wife is at work, and it is getting dark, it is altogether less fun. Tyres do soften up with use, so it is decreasingly a problem, but I have, in the past, simply returned tyres and found ones are a better combination.

Shop Owner
Posts: 110
Joined: Fri Jul 21, 2006 1:33 pm
Location: Michigan

by garysol1

My 404's are tight with pretty much every tire. I do have GP4000's on there now but I had to use my plastic tire lever to pry the tire the last wee bit. It requires a bit of effort but it will go....
Emonda SLR
Kona JTS
Specialized AWOL
Trek Stache 9.7
Specialized Fatboy

roca rule
Posts: 678
Joined: Sun Sep 28, 2008 2:23 am
Location: so. cal.

by roca rule

i have found that contis combined with anything are a hard fitting. this is what i do to to make my tires to fitt better tossthem in the oven at 150% for five to ten minutes take out set on the rim and ready before inflatting rub with a damped sponge.

Posts: 5
Joined: Wed Nov 25, 2009 6:05 pm

by BikeMechanic

Start installing the tire bead, opposite of the valve stem and finish off at the valve stem. Sometimes this makes it a bit easier...

User avatar
Tinea Pedis
Posts: 8425
Joined: Sat Mar 14, 2009 6:08 am
Location: Geelong

by Tinea Pedis

roca's on the money - Conti tyres make me want to scream some time.

Exactly the same issues with them on Fulcrum rims.

Posts: 213
Joined: Tue Jan 27, 2009 8:12 pm
Location: seattle wa

by speedwobbles

Make sure that the side of the tire which is already on the rim and the restof the side you are trying to put on are in the center of the rim bed, just like mounting a car tire. this ensures you have as much bead to work with as possible. but some combos are just plain hard, and that's why everyone should have one of these: ... px?sc=FRGL

the magic wand. every tire, every time.

Posts: 1222
Joined: Sun Jun 10, 2012 1:11 am

by addictR1

as stupid as changing a flat may be.. i'm about fed up with this.

just got my farsport 38mm clinchers along with some new Michelin Pro4 Service Road tires.

man is it a biatch to install the Pro4 tires on there. the front tire went on just fine.. but the rear.. i already have 2 pinch flats and repaired it with the park patch. and just when it's reaching close to blows...

i already took the pro4 off once and put it back on.. not sure if i should do it again.

any suggestions on how to do this? hate to waste more patches.. but i don't have a spare tube laying around. :noidea:

Posts: 1222
Joined: Sun Jun 10, 2012 1:11 am

by addictR1

22 views and no suggestions? someone help a brother out...

User avatar
Posts: 656
Joined: Mon Nov 01, 2004 3:13 pm
Location: Netherlands

by Gazelleer

The thinnest rim tape you can find may help a bit.

by Weenie

Post Reply
  • Similar Topics
    Last post