Columbus Seat Clamps for External Butted tubes
Columbus Seat Clamps for External Butted tubes

Columbus Seat Clamps for External Butted tubes


Regular price$ 27.50
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ZSC300 / Ø30mm to be used with 29.4 and 29.8mm External Butted seat tubes

ZSC325 / Ø32.5mm to be used with 32.5 and 32.9mm External Butted seat tubes

ZSC340 / Ø34mm to be used with 33.5mm External Butted seat tubes

(These are slip-fit seat collars. They are not for brazing or welding into place.)

ZSC300 = 18.7g
ZSC325 = 19g
ZSC340 = 19.2g

Weight is based on a representative sample. Actual weight may vary slightly. Imported.

Orders received by the following times (Pacific time) will likely go out that day.

Monday - 9am

Tues-Fri - Noon

Orders ship Monday through Friday.

Shipping for spray paint is only available in the contiguous US and must ship by ground. If it is purchased along with other items, the entire order will ship via ground. If you want your other items faster, please order them separately and select another shipping option.


"I just remembered something! Can you add it to my order?"

We don't have access to your payment info, so we can't add items to your order.

If you realize that you forgot an item after placing an order, just place another order for the missing item(s) and shoot us an email at to call our attention to it. We will combine the orders and refund you any excess shipping from that second order. Please do not select free "local pickup" for the second order, otherwise we may need to invoice you for additional shipping costs and that just slows things down.

"I got a USPS delivery notification but my order hasn't shown up!"

It isn't uncommon to receive USPS delivery notifications before a package is actually delivered. We're not sure if they sometimes scan the package at the post office before delivery, but typically the package shows up within 24 hours.

Please let us know if the package hasn't shown up by the typical USPS delivery time the next day and we'll get it all sorted out.

If an item is damaged or has been sent in error, we will pay for return shipping and replace the item if it is returned within 30 days purchase.

If you ordered the wrong item or changed your mind, you may return the item provided that it is in new condition and within 30 days of purchase. You will be refunded the purchase price minus a 10% restocking fee. The restocking fee does not apply to exchanges.