What size are the replacement o rings in the prestacycle set?

Question

https://www.crosslakesales.com/products/prestacycle-prestaflator-tool-rebuild-kit-o-ring-new

I asked the company that manufactures them, they said they didn't know.

Does anyone know the sizes? I ask because the set is not available in the UK. Flying it over the Atlantic seems ridonkulous when I could just buy some o rings here.

If you have the old rings, measure them. Or, better, take them to a shop and find a match. — Daniel R Hicks, May 27 '18 at 12:21
I bought a cheap multipack of "various sizes" of O rings for about $4. It will probably be a standard size. Good luck! — Criggie, May 27 '18 at 12:23
Unfortunately, i don't have the old one i need. It disintegrated and I threw it away before i thought to measure it — Ne Mo, May 27 '18 at 12:26
I'd go with criggie's approach then. Maybe take the inflator tool to the hardware shop and compare with a few there. — Batman, May 27 '18 at 12:36
I bought replacement O-rings at my local bike shop. They had them in stock. — Paul H, Dec 04 '20 at 20:13
https://www.universalcycles.com/shopping/product_details.php?id=98387 — Paul H, Dec 04 '20 at 20:14

score 7 · Accepted Answer · edited Dec 04 '20 at 19:10

7

Got mine from AliExpress 10X5X2.5mm O seal ring for US$2.

Tested it and it fix perfect.

edited Dec 04 '20 at 19:10

Swifty

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answered Dec 04 '20 at 09:25

Ron Chan

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score 6 · Answer 2 · answered May 27 '18 at 12:47

Based on the photo in the question the big O ring is 12 mm outside to outside. The O ring rubber is 2 mm thick.

Googling tells me:

O-rings made from high quality buna-nitrile (BN70) rubber with a durometer rating of 70.

This is proportional to the inventory sticker being 12.0mm high as per all the ones I found in my house.

There appear to be two other sizes in the bag as well, one smaller and one thicker like a tap washer.

Given this bag of parts is $3.95 USD from several LBS and from Amazon its hardly worth messing about. If the freight is too much, ask for an envelope not a parcel or order more things to make it worthwhile.

Stressing that this is an estimate based on the photo, not a qualified measurement from a sample. — Criggie, May 27 '18 at 12:47
Yeah it's more I don't want to rack up the air miles. Good skills with the image! :) — Ne Mo, May 27 '18 at 17:10

What size are the replacement o rings in the prestacycle set?

2 Answers2