The BB height would be very low I would of thought too, so pedals would struggle clearing a lot of trail obstacles, overall it would be a bit rubbish! You never know you might like it so much you never go back to suspension. Surely running a smaller than intended wheel would result in an abundance, rather than a shortage, of tyre clearance? What about if you buy some 29er forks and run your 26 wheels for now?
You can simply fill the tires to max pressure for when you plan on riding on the road, and then let out a bit of air before riding the trails. A mountain bike with 29 inch wheels, just like practically everything else that you could change on a mountain bike, also has some downsides. Notably, the bike will be heavier, which can be a big problem for some situations such as when you are going uphill or having to do any hike a bike sections in a trail.
Lifting a heavy bike repeatedly can cause injury to your back, as can riding a bike that is too large for you. They are also not ideal for petite riders since they are far too big, and are especially not suited for children to use. Remember, that there is a big difference between picking up a bike to lift it over a curb, and hefting it high enough to attach to the bike rack on a city bus — assuming that the particular bus in question even has one.
In addition, they take longer to get their momentum going. You will need to consider these downsides very carefully before making a decision, keeping in mind how you ride and your style. If you ride in places that require a lot of starting and stopping for instance then this will make a bike with wheels of this size seem all the heavier and bulkier to you. Not all mountain bike frames are designed to allow this change to be made to them.
However, with a full suspension mountain bike, you may be able to change the fork, which will allow it to accommodate a larger tire. Both should work equally well. A mountain bike modified in this way is called a 69er. The bike will ride a little differently, because it will be slacker in the head tube.
This makes the position more upright, which is best for downhill riding. If you prefer your mountain bike to ride more like it did before, you can reverse the stem, making it downwards instead of upwards.
If you have a full suspension mountain bike, and you want to swap in a 29 inch tire, these are the tools and supplies you will need:. Step Two: Remove the front brake by taking off the two bolts that secure the caliper onto the fork. If you have an International Standard adapter, simply remove the brake from that point.
Step Three: Remove Brake Hose. If your brake hose is attached with a small plastic tie wrap, simply cut it off, taking care to avoid the brake line.
If it is on a plastic mount, take off the hex bolt holding the clip in place, and move the brake hose and caliper out of your way. Never remove the brake line from the caliper! Step Four: Remove the Stem Assembly. Keep one hand on the lower crown, holding the fork in position as you loosen the stem bolts. When the bolts are loose, remove the stem and bar together and set it on one side of the bike.
Finally, remove the spacers and top crown race and set them aside. Step Five: Remove the fork. Pay attention to the orientation of the lower bearing race and seal. This is a good time to make sure that the bearings are still moving smoothly, and if not, think about getting a new headset.
Step Six: Remove the lower crown race. If you plan on keeping your headset, now is the time to remove the lower race. I know it isn't ideal, but any reason it wouldn't work? Edit: I have seen this question , but it addresses only changing the front wheel which would change geometry.
Improve this question. Are you sure it's a 29" wheel bike? I googled the Trek Cali and only found Frame says Virtual 14", Actual 13". It is running 29x2 Bontager with a 29" fork up front. I was like you, I did my google searches and figured it was a While not ideal, I thought my daughter could handle it.
I am guessing it is 3 or so years old. Perhaps before Trek started adjusting their smaller frames to run smaller wheels. Is the bike truly ridable? Is the stand-over low enough? If so, wheels just looking too big are not really a problem. I have trouble believing a 9-year-old can ride a 29" bike. How tall is she? Yes- good kids bikes are hens teeth and expensive for the years you get out of them.
The bike IS too big for your daughter, anything you can do to make it a better fit will be a big benefit. Also consider shorter cranks as well. With the same casing construction, width and air pressure, larger diameter tyres deform less and therefore roll faster. Testing this in a lab is the best way, as it totally isolates the result from external factors such as wind, trail surface and line selection, not to mention what you ate for breakfast.
Thankfully there have been a couple of studies and German tyre company Schwalbe has been kind enough to let us in on their findings. This aspect was used to assess traits such as stability and traction but rolling resistance was tested in the lab.
Their testing found that 29ers do have lower rolling resistance than their inch equivalent. The most pronounced difference was found on asphalt and gravel harder surfaces at lower tyre pressures. Higher air pressures and softer surfaces brought the results closer together, although the 29er always had the rolling edge.
My personal observations also back this up. Furthermore, there are things you can do with a inch bike that will narrow that rolling resistance gap. Studies conducted by tyre manufacturers Schwalbe and Continental as well as independent labs such as Wheel Energy in Finland have all shown that wider tyres offer lower rolling resistance than narrow ones at the same air pressure.
Once again it comes down to distortion in the tyre casing; a wider tyre has a larger air volume and produces less sidewall flex at a given air pressure. A 29x2. So given tyres of equal mass, the fat 26er may come even closer to the rolling resistance of a 29er. So once you get up to speed on a fast hard pack fire trail, aerodynamics will become a factor, and the When the trail surface is soft, rolling resistance can vary greatly.
The same study showed that a rock hard 54mm wide tyre requires watts more energy to pedal on soft grass when compared to a 62mm wide tyre inflated to 21psi.
Flotation and the size of your contact patch on the trail becomes the important factor when traversing soft terrain. Another frequently espoused furphy is that inch wheels have a bigger footprint on the trail and therefore provide better traction. With both running 27psi, a 26x2. What changes is the shape of the footprint with the 29x2.
To put more rubber on the trail you need to run lower air pressures. You can ride a fatbike with 6psi in the tyres and they have a massive footprint on the trail—the traction that they produce is a total game changer.
So all things being equal, you should be able to run a 29er tyre with If you typically run 30psi in inch wheels, you should be able to use Of course you can mount Swap from 26x2. This again permits lower air pressures and creates better traction with less tyre squirm when cornering. So yes, on a consistent trail surface inch wheels can improve traction, but you can also enhance the traction of a inch wheel by mounting fatter tyres which will probably be similar in weight to the 29er rubber too.
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