What if bike is slightly too big?

On a bike that's too big you can lower the bars a fair amount by making sure the stem is at the lowest point on the steerer tube without any spacers underneath. If your bars are already at this point, the next way to lower the bars is to get a stem with a high angle such as 15 or so degrees.

ilovebicycling.com - How to Make the Wrong Size Bike Fit - I Love Bicycling

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In the ideal world you always get the exact size bike for your size and fit it properly. Unfortunately that doesn’t always happen as maybe a friend had a bike that they were getting rid of or the bike you have a deal on isn’t quite the right size. It depends on how far off the size of the bike is if you can make the wrong size bike fit. If you should be on a large, 58cm road bike or 20 inch mountain bike, fitting a small 52 cm road bike or 15 inch mountain bike just isn’t going to happen and vice versa. If the bike is relatively close however, there are a number of changes that you might be able to make to get the bike to more closely fit you. If you can’t get the bike to your ideal position, it is not recommended to ride more than just around town as an improperly fitted bike can cause injury specifically to your knees and back but other areas as well.

Where Doesn’t the Wrong Size Bike Fit?

To determine what adjustments need to be made to the bike, you first need to get on it and see where everything falls. Consulting the article “How to Do a Proper Bike Fit” will help to show you where you should properly be positioned on the bike. In general, you will know right away if a bike is too short in the top tube or with the saddle height. Depending upon where your differences are, you may have to do one or all of the following if your bike is either too big or too small.

Too Small of a Bike

A wrong size bike that is too small can be easy to make fit if it only requires small changes but past that you may need different parts such as a stems or seat post. It is typically easier to fit a smaller bike than too large because simply it is easier to lengthen something on the bike as shortening something past the limits of the frame simply isn’t possible.

Longer Seat Post

The first thing that you should adjust on the bike is the height of the saddle. Seat posts typically have a fairly long length so can be extended quite far. On all seat posts, at least if it hasn’t worn off, there is a maximum extension mark. Never position the post past this point as there is not enough post in the frame to adequately support the weight. If you do, the frame can actually bend and break quite easily. The solution to raising the seat further is to get a longer seat post which can be found relatively easily at your well stocked local bike shop or online. A 350mm length post is about as long as you can easily find. Just make sure you get the right size diameter post as most bikes have different sizes.

Increased Saddle Set-Back

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Having too small of a bike places you too far forward on the bike. Sliding your saddle back can help solve this. The first way to do this is to loosen the bolts on the rails of the saddle and slide it back as needed. If you find you can’t slide it back far enough, you can get a seat post that has increased set-back. Standard typically ranges from 10mm to 20mm. You can find however 30+mm setbacks but you’ll have to shop around. And if you find a post with the right set back but the diameter is too small you can use pre-made shims to make it fit properly.

Longer Stem

The next area of the bike that is probably going to be an issue is how close the handle bars are to your body. The solution to this is a longer stem which will push the bars further out in front of you. Depending upon how long the stem is now, you can get a stem around 140mm to 150mm in length. The thing to watch out for here however is with an increased stem length, the handling of the bike decreases because of how far the bars are from the pivot point, the steerer tube.

Raising the Bars

The last thing that you will probably have to do on a slightly small bike is to raise the bars. You can do this in two ways. The first is to make sure that the stem is placed at the very top of the steerer tube with no spacers above it. The second is to get a stem with a high angle which will raise your bars. Zero to seven degrees or so is typically average but you can find stems with angles above fifteen degrees.

Too Large of a Bike

A wrong size bike that is too large can be a challenge simply because you can’t lower a saddle past the frame along with the handle bars. If the bike’s not too small however these few techniques will get the position to where you need it.

Shorter Seat Post

The limit on how low the seat post can go is where the bend on the top of the seat post is. If you find that when you try and lower the post all the way to this point and it hits something, it’s typically the post bottoming out on the water bottle cage bolts. A simple solution to this is to cut the seat post shorter. Only cut off however the minimum that you need as if you raise it and don’t leave a corresponding amount of post in the frame, you can break the frame.

Sliding the Saddle Forward

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Sliding a saddle forward on the bike can bring you forward enough to potentially fit the bike better. You can loosen the saddle bolts and slide the seat forward as far as it will go in the rails. Past this you will have to get a seat post that has a forward bend to it or a post that is designed to be able to flip around and still place the saddle at the correct angle.

Shorter Stem

A shorter stem can bring the bars closer to you. 50mm is about the shortest stem you can get. With excessively short stems, as with excessively long stems, the handling of the bike can be affected. Short stems give a bike more of a twitchy feel as the same degree of bar rotation turns the front wheel a greater degree than would a longer stem.

Lowering the Bars.

On a bike that’s too big you can lower the bars a fair amount by making sure the stem is at the lowest point on the steerer tube without any spacers underneath. If your bars are already at this point, the next way to lower the bars is to get a stem with a high angle such as 15 or so degrees. There are no negative angles as a stem can be placed right side up and right side down depending on the need. Just make sure you get the right size stem for the diameter of your bars. As long as the wrong size bike isn’t too far off in size, it is relatively easy to make a bike fit with the right approaches. You may need a few different parts but the price of those parts is probably going to be much less than what you would otherwise spend on a bike that you don’t have a good deal on. The bike will ride different than a properly fitted bike but you can get used to it. Just make sure that the position isn’t too far off as if it is, you are only setting yourself up for injury and whatever savings you may have simply aren’t worth it. Take your time and past these suggestions don’t do anything extreme to make a bike fit as in general it probably isn’t going to be worth it.

ilovebicycling.com - How to Make the Wrong Size Bike Fit - I Love Bicycling

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