700x38c = 29er ?

sebastianlieken

I have a specialized crosstrail with 700x38c hybrid tires. I want to take the bike onto some tracks but need bigger tyres, will something like a 29"x2.40" offroad tire fit onto my wheel?

nak

sebastianlieken wrote: »

I have a specialized crosstrail with 700x38c hybrid tires. I want to take the bike onto some tracks but need bigger tyres, will something like a 29"x2.40" offroad tire fit onto my wheel?

You may not have enough clearance for MTB tyres. 29 x 2.4 is big, I have 2.1 and 2.25 on my MTB. Cyclocross tyres might be a better fit.

Tenzor07

As far as I know, 38c is 38mm in width, a 2.4 width tyre is 61mm

So, basically no, it won't fit...

Lumen

Do you really need larger volume tyres? What sort of tracks are you going on?

devonp

sebastianlieken wrote: »

I have a specialized crosstrail with 700x38c hybrid tires. I want to take the bike onto some tracks but need bigger tyres, will something like a 29"x2.40" offroad tire fit onto my wheel?

i have the same bike comp disc model , i've ridden some pretty rough stuff on the Royal canal btw city and leixlip, never had a prob or puncture, i use the original Trigger sport tyres that came with the bike and replaced with same , had to source on the net for replacements

JBokeh

2.4s are an enduro tyre, you'd be pushed to fit it under the seat stays of a lot of hard tail MTBs

Can't help you on the Diameter side of thing, but I though a 700c wheel was a 28"? On something like a hybrid id be sticking 1.9" - 2.2" tyres just for the sake of clearance, and I'd also be taking it handy, because the fork on it is designed for ironing out undulations in the road, not for ripping down a trail with, but you'll be fine if you take it handy, and choose the smoothest line rather than the fastest line down the trail

Lumen

JBokeh wrote: »

Can't help you on the Diameter side of thing, but I though a 700c wheel was a 28"?

28" and 29" are rough tyre diameters. They both fit on a 622mm BSD rim, otherwise known as 700c. So a 29er/29" MTB wheel and a 700c/28" road wheel will in theory fit the same tyres, more of less.

sebastianlieken

Okay so diameter is sorted, they're 622mm inside diameter which is "700c" which is the same as a 29" tire.

Width, okay maybe 2.40 inch (61mm) is too big so. So the current tires are 38mm, maybe a 2.1 will be enough.


The trails i'm riding can be aggressive enough at times (borrowing a mates bike atm). the trails can be pretty steep, loose, and dry. Lots of jumps and bumps, quite a few small roots aswell. That's why I want something that can bite in for traction and stop on the downhill loose sections, something big enough to soak up roots, and something knobbly enough to allow me to cycle up hill on the loose sections.

the current tires (as mentioned by Devonp) are hybrids. Smooth rolling centre with knobbly bits on the sides. Fine for most stuff but i'll be in trouble on the straight up hill and more importantly, straight downhill.

EDIT: This is Australian dry/loose type track i'm talking about btw

Tenzor07

Looks amazing!

Though.. I think you're slightly crazy to be attempting those trails at any sort of speed on a Crosstrail, tyres would be the least of my worries, more like being thrown off the bike or frame/forks snapping! :eek:

JBokeh

Lumen wrote: »

28" and 29" are rough tyre diameters. They both fit on a 622mm BSD rim, otherwise known as 700c. So a 29er/29" MTB wheel and a 700c/28" road wheel will in theory fit the same tyres, more of less.

Everyday is a school day, I've had 29ers but never actually payed any attention to the actual size of them

I'd also be slow to do it on a cross trail,looks like amazing fun could be had on a trail like that, but either you or the bike will be taking an awful beating. IMO you'll end up going too slow to really enjoy it, and you'll end up rolling of the drop offs. Look on the likes of Gumtree, a few of my mates in OZ got some pretty nice Giants and Treks off that site for small money, and they had a good spec.
A 100mm travel hard tail would be the minimum for rider comfort, but to get the most out of the trail i'd want to be using 120mm forks at least, to be able to take the hard lines over roots