Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Not great for smaller people

We were pretty excited to try this device out. So we decided to buy a really nice commuter bike since this would not work on my wife's road bike.Unfortunately after installing this, we had to lower the seat post all the way down, and the ride is still not comfortable. The ibert is placed as far forward as it can be, and the saddle is placed as far back as possible. The problem is there's not a large enough gap between the saddle and the ibert if my wife needs to stop without tilting the bike a lot.We contacted the company, and they said that this was a problem for many smaller bikes. At the time of purchase (and now) there was no mention that this might be an issue on the web site.We might experiment a bit with this, but we may end up having to re-sell this, and purchase a rear-mounted bike seat. I think this product would be great on a larger bike, my child truly does love it.