The Jump Stop weighs 30 grams. • The clamp is made of fiber-reinforced and UV stabilized DuPont Zytel--easy on your frame finish. • All steel is stainless. • Tool is included. • No-hassle / no-time-limit warranty (if any part fails, I replace it). • Black only.

Most steel frames take the 1-1/8 (29mm) clamp size. Aluminum, titanium, and carbon fiber frames will take one of the larger sizes. If the size is in doubt, it is often stamped on the front derailleur clamp. Otherwise, the easiest way to determine seat tube diameter is to cut a strip of paper 4 inches (100 mm) in length, and wrap it around the seat tube. If the ends overlap by more than a quarter inch (7mm), it's 1-1/8 (29mm). If the ends just barely meet, it's 1-1/4 (32mm). If the ends have a gap between them greater than a quarter inch (7mm), it's 1-3/8 (35mm). If you have questions about how difficult it is to mount the Jump Stop, the instruction sheet is reproduced here.

Recognizing that not everyone has access to a good local bike shop, the Jump Stop is available direct for ten bucks (U.S.).  Pre-payment is not required.  You are welcome to try the Jump Stop out first, to make sure it fits and performs well.  If all is satisfactory, you can drop ten bucks (cash, check, or money order) in the return envelope, or it's $10.40 via PayPal (at the e-mail address given below).  On the other hand, if you decide not to keep it for any reason, just mail the parts back. (no need to repackage)

To order one, either e-mail me or call me at (800) 659-4607. All I need is your name, what diameter clamp you need, and the postal address you would like me to send it to.

You can also contact me either of these ways if you have any questions.  (It saves me money if I can call you back.  I have to pay a premium rate for minutes on the 800 number.)  Thank you for taking the time to read about the Jump Stop.