On Tue, 17 Jan 2017 08:04:14 -0800, Joerg
wrote:

You won't see slow leakage anymore after switching to the thick tubes.

I hope not.

How thick are the Sunlite tubes? It seems they also make 2.25mm thick
tubes:
https://www.amazon.com/Sunlite-Dirt-2-25mm-Thick-Tubes/dp/B016QRR4TU
Racing tubes seem to be around 0.7mm while street tubes seem to hover
around 0.9mm. I can't find a number for the ones you recommend.

Also, do you have a rubber hardness gauge?
http://www.ebay.com/itm/162026017972
I have one which I use to measure automobile tire hardness, o-ring
flex, gasket hardness, and effects of UV hardening, temperature,
solvents, etc. However, I've never bothered to test bicycle inner
tubes. Time permitting, I'll do some quick checking. Note that the
way the gauge works is to attempt to shove a needle into the material.
Hopefully, that won't puncture the tube.

I believe you do not live in hilly terrain but in the Bay Area and there
the increased weight won't matter much. The increased rotating mass
might but only if you have lots of stop and go traffic, with a lot of
braking.

Well, I live in the Santa Cruz mountains, which are full of hills.
However, I don't ride around my house. What little I do these days is
a few excursions, and some local errands. I seem to be putting more
mileage on my indoor bicycle trainer than on the road. During summer,
I do service calls on my bicycle, which carrying a backpack full of
tools and junk. Running errands around town involves some stop and
go, but we have a nice multipurpose road that parallels the river
which bypasses most of the traffic.

--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558