Crazy Bob question

[Ghosty]

Not quite sure where to post this so I'll stick it in general.

I've bought some Schwalbe Crazy Bobs for a project I'm working on, but haven't shown on here yet.

Seeing as I found a 2.1+ tube in my work room, I've been trying to get one on a rim, but I can't for the life of me work out how they sit on the rim.
I've got the wire beads on fine, but there's a weird second lip on the tyre that wants to half sit under the rim, and half over it. I can't get it to all sit under the rim (on one side let alone both) as it just pops out as I move on to get a bit more under, but likewise it won't all sit over the rim either. If I pump the tyre up it's very wobbly and not straight at all.

Which way does it go, or does anyone have any tips? What am I doing wrong?
Going to try it with a different tube regardless as the one I have now doesn't have a threaded valve stem, and the valve won't sit straight either. It's not just he area around the valve that's a problem, it's the whole tyre.

Here's a teaser of the project:

 

[kingoffootball]

I've not tried those tyres myself, but looking online a lot of people seem to have had similar issues and it seems to depend upon the rim. What rims are you fitting them to?

I assume with two lips it depends upon how deep the rim is as to whether they sit alright.

 

[SEANSTEPHENS]

Re:

I find that heavy street tyres with steel beading like these always have this problem, i have some maxxis that are exactly the same. However the type of rim your using doesnt help matters, because they werent designed for use with such a tyre. This is why i stick to folding tyres if i can because theyre more forgiving, and they stretch a little with a bit of force. Plus im always happy to save a couple hundred grams.

As for fitting the crazy bobs; your just gonna have to be persistant... Using plastic tyre levers or spoons aint gonna do shit, apart from bend and break. Get a flat head screwdriver and carefully force the tyre on, Little sections of tyre at a time. Try buying some tyre slip from a motoring shop if theyre really tight

 

[kingoffootball]

Re: Re:

I find that heavy street tyres with steel beading like these always have this problem, i have some maxxis that are exactly the same. However the type of rim your using doesnt help matters, because they werent designed for use with such a tyre. This is why i stick to folding tyres if i can because theyre more forgiving, and they stretch a little with a bit of force. Plus im always happy to save a couple hundred grams.

As for fitting the crazy bobs; your just gonna have to be persistant... Using plastic tyre levers or spoons aint gonna do shit, apart from bend and break. Get a flat head screwdriver and carefully force the tyre on, Little sections of tyre at a time. Try buying some tyre slip from a motoring shop if theyre really tight

Unless I misunderstood, it's not getting the tyres on the rims that's the issue, it's getting them to sit right.

 

[Ghosty]

Yep, just not sitting right. I'll add some pics when I'm home later.

 

[Ghosty]

Okay, I'm back.

The bead looks like this:



I can get the lower bit on fine, but the upper bit can't seem to decide if it's going to sit above or below the rim, and neither can I.

Some of it sits like this:


But some of it's like this:



It's very, very difficult to get all of one and none of the other. I'm tempted to say the second lip goes outside the rim, but I'm really not sure. At the moment it just seems to be that one length of the tyre's sitting lower in, in about the same place on both sides - just pump it up and leave it perhaps?

Rims are Alesa, and 559x21.

 

[PaulE]

Re:

I had one of those on a bmx ages ago. The second lip should sit above the rim, like the first pic. Blow them up as hard as you dare, it should pop into place (seen to remember there bmx ones were good to 100psi, no idea about those). Maybe a bit of soapy water on the rim to help?

Once you've tried that, if it still didn't work, drop the pressure down again and try to pull the tyre outwards to pop the bead on.

 

[Ghosty]

Thanks for the advice! Just about got it sorted now.

Turns out the original rims on the Saracen were straight walled and the tyres were no good - I've got my other wheelset on now (origianlly from my Cinder Cone) and it's nearly good to go

 

[jonnyboy666]

Re:

i fitted a bmx set today, utter sods! the extra lip sits above the rim, i had to lubricate the side of the tyre so that when i inflated it it then popped mostly into position, then deflated the tyre a bit but with some air in the tyre i then gradually man handled them into place, inflating them up to about 80psi then down again, man handling etc, up to 80psi and on until they were seated.

never ever gonna stock them again after that! worst tyre ever to fit.

 

[Ghosty]

I had exactly the same problem, lot of inflating/deflating. They look cool though so I'm not going to complain, it wasn't nearly as painful/irritating as trying to get a set of folding 700x23 Bontrager RLs on to some road wheels a while ago.