light weight tubes!! thoughts??

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light weight tubes!! thoughts??

Postby ezz222 » 12 May 2016, 11:43

I'm looking to save some weight
Last edited by ezz222 on 18 May 2016, 12:55, edited 1 time in total.
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Re: light weight tubes!! thoughts??

Postby bigpimp347 » 12 May 2016, 15:41

Rubena Speedo 290g 90g lighter than power blocks, and handle more PSI,
and foldable too... what i'm running and they seem fine to me, stick really well, not thought too much about them.
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Re: light weight tubes!! thoughts??

Postby ezz222 » 12 May 2016, 16:27

I've already got my new tyres mark. Just looking to save on the inner rubbers now.
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Re: light weight tubes!! thoughts??

Postby bigpimp347 » 13 May 2016, 12:59

no worries eric..
to be 100% honest i'm not sure all the weight saving makes that much difference,
changing my cranks i added weight, bigger pedals added weight,
made the bike feel better..
i could lose a lot of weight if i wanted to but not sure i can handle the weight loss :lol:
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Re: light weight tubes!! thoughts??

Postby LeeroySilk » 13 May 2016, 17:03

Years ago it was fairly common to run 16" tubes on 20" wheels, I couldn't tell you what the exact weight saving was but a little bit of math suggest it'd be in the region of 20% weight saving. I used to run 16" tubes with no real issues; punctures were never more of issue, nor blowouts. Although 'back in the day' tyre pressures were much lower. 50 - 60 psi Vs 90 - 100 psi.
Not sure if you can buy latex tubes for 20", these would be considerably lighter than std butyl tubes, keep in mind that latex tubes typically require blowing up daily.
I read somewhere recently (can't remember where exactly), saving outer circumference rotational weight gives approx. 4x the saving of static weight. 25g saved at the rim would feel like a 100g saving.
From my own personal experience, a lighter front wheel makes the bike feel a lot more responsive, turn in feels sharper and change in direction is quicker (I feel like a car journalist!), although trying to save too much weight made the front feel sloppy and had the opposite effect.
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Re: light weight tubes!! thoughts??

Postby bigpimp347 » 14 May 2016, 20:11

i agree on the handling..
i ran 1.75 front and 1.60 rear for a while, then went to 1.60 both and felt so much quicker and easier to handle in berms.
now running Rubena Speedo tyres, their 1.75 is as wide as a power block 1.60 (yet 90g lighter)
and they feel great, they are also rated at 80psi yet i only run mine at 60psi recently due to bumpy tracks, and they certainly absorb them bumpy berms without losing speed or handling.

that said what's an average weight for a race bike these days..
i think mine at 19.93lbs and 20.12lbs are great (FTB XL) yet i've seen others running near 18lbs and some previous bike si've had have been 21lbs..

where do you draw the line, stupid light, twitchy unable to handle due to being too light,
or like a street bike 21lbs and handles great due to the weight and easier to control..

sorry erik for taking over the thread :)
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Re: light weight tubes!! thoughts??

Postby ezz222 » 17 May 2016, 09:12

Haha no worries mark and thanks for your input leeroysilk
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Re: light weight tubes!! thoughts??

Postby motox2k » 17 Jun 2016, 08:30

tubeless :-)
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