Tyre questions...

[alvintc]

Morning everyone – hope 2017 is kicking off well!

It’s finally time to replace my trusty CX tyres. The bike came with Schwalbe Racing Ralph, 700x33c.

Is there any material difference between 700x33c and 29x2.25? The price difference is £36 vs £16!

If it helps, they're to go on some mavic aksium discs, doing around 100 miles a week, all weathers etc..

 

[Chris S]

The 29x2.25 tyres are 21mm wider.

Even if you can get them seated on the rims properly then the top of the forks might still not be wide enough for them.

 

[S-Express]

Is there any material difference between 700x33c and 29x2.25?

There's obviously quite a significant width difference. You probably won't get 2.25s in a CX frame.

 

[alvintc]

hmm.. so any recommendations? For my sins, the commuter is a cannondale superx ultegra disc...

 

[Grant Fondo]

Lovely bike btw.
Personally i would stick with whatever Cannondale have supplied, they tend to do it for a reason....have learned this over 20 years of owning their MTBs and road bikes...added to which Schwalbe are damn good tyres.

 

[Racing roadkill]

Morning everyone – hope 2017 is kicking off well!

It’s finally time to replace my trusty CX tyres. The bike came with Schwalbe Racing Ralph, 700x33c.

Is there any material difference between 700x33c and 29x2.25? The price difference is £36 vs £16!

If it helps, they're to go on some mavic aksium discs, doing around 100 miles a week, all weathers etc..

The 700x33c are narrower, and designed for CX / Hybrid / Gravel bikes, with the associated clearances. The other ones are designed for a 29'er mountain bike. As with most of these things, manufacturing numbers / volume and yield account for the price disparity.

 

[Racing roadkill]

hmm.. so any recommendations? For my sins, the commuter is a cannondale superx ultegra disc...

If you're not actually mud plugging / barrier hopping, I'd personally go for these.

http://www.wiggle.co.uk/schwalbe-marathon-plus-smartguard-rigid-road-tyre/

If you are mud plugging / barrier hopping,

These

http://www.wiggle.co.uk/michelin-cyclocross-mud-2-folding-cx-tyre/

 

[alvintc]

I've run marathons before - while I'm not actually CX-ing, the route I take in winter (old railway line) has enough mud/ ruts/ slippery stuff that the CX tyres make it necessary.

I think I'll just bite the bullet & get new RR's - I've liked them so far & saving a couple of quid at the risk of not liking something seems a bit silly..

 

[Ajax Bay]

Is there any material difference between 700x33c and 29x2.25?

The 29x2.25 tyres are 21mm wider.

The 33s are about 33mm wide. The 2.25" ones are 57mm wide: 24mm difference - so unlikely to fit a 'CX' bike.
Edit: See post #12.

 

[Ajax Bay]

schwalbe-racing-ralph-performance-folding-cyclocross-tyre-700c
Given this is for the bike you use for commuting, stick with 33s (though maybe 37s would fit, may depend on mudguards) - so 33, 35 or 37-622.
May be worth looking at the other options eg in Chain Reaction - link (CX tyres)

 

[Chris S]

The 33s are about 33mm wide. The 2.25" ones are 57mm wide: 24mm difference - so unlikely to fit a 'CX' bike.

I thought 29x2.25 was ETRTO 54-622? Anyway, they're still unlikely to fit.

 

[Ajax Bay]

I thought 29x2.25 was ETRTO 54-622?

No they are 57-622, but, fair play, I have done a check on 'rollingresistance.com' and several measure up narrower than 57 (eg 52 and 54) so your '21mm more' is correct in reality if mounted on 17mm width rims (which is probably what OP has, running 33-622 RRs).