Michelin tube size with HED Jet 6?

Triathlon Forum
1

Since the Jet 6 is a wider rim do I get the 18-20 or the 20-25? If I go with the wider tube can I still use that size on my H3?

chris

2

What size tire are you using?

3

700’s
.

4

700 x what?

5

Hello christian1 and All,

If I read this data correctly it appears that AFM’s Crr tests show that 18-20 latex tubes have a better Crr than larger latex or butyl tubes in 700x23 tires.

http://biketechreview.com/tires/images/AFM_tire_testing_rev8.pdf

Cheers,

Neal

6

Pro Race 3’s. I believe 23

chris

7

The C2 rim is pretty damned wide. When you pair that with a 23mm tire, that’s a lot of space for the smaller tubes to fill. There’s a reason that manufacturers make the wider ones… and while Al’s Crr tests suggest that the smaller diameter latex tube gives better numbers, he didn’t test it with a C2 rim.

I’d do the larger tubes. Definitely.

8

When I used a 18/20 latex tube w a 23c tire, it went boom. Tube clearly seemed too small for the tire size.

9

Hello tttiltheend and All,

I have used Michelin 18/20 latex tubes in Michelin Pro Race 2 (actual size 24mm) and MPR 3 23mm (actual size 23mm) tires mounted on year old Zipp 808 rims (probably not as wide as new Hed rim) and it has been working great for over a year. I use them for training with lots of miles. I run them at 120psi.

I have had only a couple of flats. One a large glass cut (the Vittoria Pitt Stop oozed out the large cut quickly and did not work to fix it). And one flat the result a poor job of tire mounting by me and I got a pinch tube flat.

I had to boot the tire with the glass cut to get home and used a piece of a butyl tube I had in my kit. The butyl tube was too soft and the boot bulged like it was going to pop, but it held.

When I got home I made a new boot for my patch kit that I cut from an old tire so it had some cords in it for strength.

I have read that the Crr difference between different size latex tubes is small and having confidence in your wheel/tire/tube when desending fast is important so use the tube you like best.

More info:

http://forum.slowtwitch.com/gforum.cgi?post=1800424#1800424

Cheers,

Neal

10

Thanks all.

chris