Bicycle Crossbar Adaptor by Delta Cycle, Bike Bar Adapter for Bike Rack - Quick Release Clamps Instantly Adjusts to Fit Cruiser Bikes, MTBs - Max 32.25" Min 23" Telescoping Bike Rack Adapter Bar

Great product. Simple design and great price. Worked on a small girls bike all the way to a full sized women's flat foot bike. I measured the minimum distance between the hooks @ 21 inches and with the tubes fully extended @ a maximum of 29 inches. Max distance between the tips of the hooks is 25.5". If the distance between the outside of your seat post and the outside stem is greater than 25.5 you would have to seperate the tubes to get the hooks around the post and stem. See photos and notes.Both rubber hook ends are coated with a high quality rubber material that is thick and will not scratch your bike. The design is simple. Basically you have two tubes that slide in and out of each other and a quick release locking mechanism like you find on the seat post of bikes. Compared in price to the other cross bar substitutes this is a good choice. The less expensive "Allen Tension Bar" has a exposed metal end that would scratch your bike and the customer reviews complain of the spring tension design pinching their fingers. The name brand thule frame adapter is listed for over $30 dollars. Would buy again and suggest to friends.

The only purpose of a sub bar is to let you put a bike with closed geometry on a bike rack. This includes a lot of drop-topped women's bikes, hybrids, etc. In come cases, you need a regular top tube because you don't want the bike sitting at a really weird angle. Or you might need one because the angle makes it impossible to add a second bike to a rack.In either event, this tube works. It has no internal compression, so it will only fit as closely as you compress it. This means that the bar can feel a little "loose," which may cause you a consternation that it is going to detach. However, I've used this on my wife's hybrid a number of times, and the cross bar seems to hold up. On the other hand, a compression bar will have a more snug feel.The upside to using a non-compression bar is that it is easy to adjust. You don't have to worry about having cold, wet hands and the bar slipping out. Nor do you have to worry about not being strong enough to stretch the bar out.On the other hand, one of the downsides is that you have more "hardware" to deal with, and you might have to move it around a bit to make sure none of it is hitting the tie downs on your rack. I use a Yakima Joe, and haven't had any problems with this bar.It's lightweight, it works, and it's pretty inexpensive. If you know how to use any of the quick-adjusts on your bike, you know how to use this. It requires no strength or traction to install. Overall good product that got the job done.

I have a Specialized Enduro Expert and because of the dropped frame design, it doesn't fit on a standard rear-mounted bike rack (instead, it needs a top rack rail system). This bar works great. It's heavy, well cushioned on the hooks, the adjuster stop is tight.PRO:1, ease of use. Just hook it around the seat stem and the handlebar stem, tighten the collar down, and you are good to go.CON:1, on the narrower (inner) pipe end of the bar, it would be nice if it came with a "collar" to bring it up to the same diameter as the outer pipe, so that when it is placed on the rack arms, the straps that hold it would hold it tight. I happened to have a collar from a bike-lock holder install kit that I used, and it holds the bike TIGHT. Without this little collar, it jiggles--and any movement on the rack just adds stress to it, causing potential failure and I lose a few thousand dollars worth of bikes on the road.That's the only beef I have with it. Otherwise, it is a good product, and it doesn't damage the bike at all, which is uber-important.

I use this device in a different fashion than most, as I have a hitch mount tray style rack. It however has a center placed securing method instead of over the tire one, and this presented a problem with my wife's step through style bike. I got cross bar so that I could lower the arm on it, and it worked like a charm to clamp her bike securely in place. The only thing is that my bike has to go in the back side of the rack since hers is tall than mine, oh well. Easy to use, great scratch resistance, and works well. Get it.

We have a few odd mountain bike frames and this bar works fairly well. I would look at the saddles that hold a normal horizontal tube before buying this. My Yakima rack has a long cushioned saddle with straps at each end to secure a frame. This bar's clamp ends up sitting on my saddle making it hard to strap down. I would imagine if you had a rack with two legs that hold the top tube in two places independently, you could slide the clamp to one end or the other. We can barely squeeze to one end to get a strap over.It also seems to slop a bit, but gravity seems to work with that. You'll find your head and seat post are not parallel tubes. So when you clamp this on, it may need to be at the highest point to clear your 'odd' top tube. then as you lift the bike onto your rack, the adapter bar will 'fall' since your seat post is angled, and therefore the length needed is shorter as you go lower. Once you jockey it onto a rack, the weight of the bike will slide the adapter back up, but a nuisance.