Weight: 30 grams
All steel is stainless
UV stabilized Zytel clamp (black)--easy on your frame finish
No-hassle warranty -- If any part fails, I replace it.
The Jump Stop clamp is sized to match the outside diameter of your seat tube or derailleur post. It comes in three standard sizes.
Small fits 1-1/8 inch or 29mm (28.6 nominal bare tube size, before added finish thickness) and these are rarely anything but steel frames. (Some earlier US bikes and recumbents used 1 inch tubing. I have shim material to adapt the small clamp to fit this size.)
Medium fits 1-1/4 inch, or 32mm (31.8 nominal bare tube size) and these can be any frame material.
Large fits 1-3/8 inch, or 35mm (34.9 nominal bare tube size) and these can be any material, though rarely steel.
If the seat tube has a uniform diameter, then the Jump Stop clamp size should be the same as the front derailleur clamp size. If there is no size stamped on the front derailleur, or there is no front derailleur, 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 probably 1-1/8 (29mm). If the ends just barely meet, it's probably 1-1/4 (32mm). If the ends have a gap between them greater than a quarter inch (7mm), it's probably 1-3/8 (35mm). If you have questions about how difficult it is to mount the Jump Stop, the instruction sheet is reproduced here.
The Jump Stop is available through some independent bike shops (primary US distributors are QBP and Cyclone Bicycle Supply) and is also carried by some mail order outlets. But if you would like to order direct, you can e-mail me at firstname.lastname@example.org or call (800) 659-4607 (toll free) or (830) 755-4607 (local or toll). I will need to know what size you need and the destination postal address. I don't require pre-payment, so if you would like to confirm that the Jump Stop is the right guide for your bike, you are welcome to try it out first to make sure it fits and does what you want. Then you can decide whether or not to keep it. (If not, just mail the parts back.)
If you decide to buy, I accept cash, check, money order, and Paypal (to email@example.com). The following charges would apply.
1 unit $12
2 units $22
3 units $31
4 units $39
5th unit and beyond an additional $7 ea.
Paypal $0.40 per unit
United States No Charge
The international postage rate hike of Jan. 2013 has hit small packages especially hard, even worse than in 2012. For example, at the start of 2012, USPS charged $3.45 to send one Jump Stop to most overseas countries. Now they charge $9.45 for the same shipment. And the new tables bundle weights together in an odd scheme which makes calculating for multiple units less straightforward.
I normally include a 4mm (5/16 in.) hex key (allen wrench), but that does add weight. For those who already have a wrench that size, leaving that out would be one way to economize.
So, shipping for one unit, with no wrench would be:
All countries outside the U.S. $5
For one unit with a wrench, or two units with one wrench, shipping would be:
For three to six units with at least one wrench:
For larger international orders, e-mail me and I'll figure it up.
In the U.K. my importer is Ison Distribution. They supply a number of shops, as well as the mail order outlet at billys
If you have any questions, feel free to e-mail or call. (If you call my 800 number, it would help me to contain costs if I could call you back.) Thank you for taking time to read about the Jump Stop.
303 Whitworth Rd.
Boerne TX 78006-8559