subject:"\[RBW\] Re\: tire pressures"

Re: Re: Re: [RBW] Re: tire pressures

2016-09-16 Thread john . hawrylak

1 Avoiding Tire CollapseThe members who crashed or fell seemed to have pressures 50% below the Berto Pressure. I chose 25% (or keeping the pressure >= 75% of the Berto Pressure) since it provides margin. I see it as a Lower Limit I do not wan to be below.2 Supple TiresExperiment with 10% or 15% below the Berto pressure (or 85% to 90% of it) and see if it improves. You are still above the 25% lower limit.I feel a supple tire would drop 15% at a pressure of 85% to 90% of the Berto Pressure. The supple tires sound great, but they are not magic.I think Compass is leery of endorsing any pressure except the Mfg Pressure since they are dealer. If they say, "just the lower the pressure" and someone does, and then crashes due to a collapsed tire, Compass may have liability problemsHope this helps On 09/15/16, Lungimsam wrote: Thanks for the info and help.This makes an interesting study to see at what percentage underinflation from the Berto recommended pressures correlates with tire collapse. Looks like 25% so far.But I still wonder if Berto chart applies on supple tires with wide rims, as I think I read a BQ blog post ttat stated he used stouter tires on narrower rims for his study.@Steve:I like the 700c. I'll probably, at some point, experiment with 650b but don't know if that will work well. But I'm keeping it 700c for now. It rides great.-- You received this message because you are subscribed to a topic in the Google Groups "RBW Owners Bunch" group.To unsubscribe from this topic, visit https://groups.google.com/d/topic/rbw-owners-bunch/tzq57fP7SZA/unsubscribe.To unsubscribe from this group and all its topics, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com.To post to this group, send email to rbw-owners-bunch@googlegroups.com.Visit this group at https://groups.google.com/group/rbw-owners-bunch.For more options, visit https://groups.google.com/d/optout.

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Re: Re: [RBW] Re: tire pressures

2016-09-15 Thread Lungimsam

Thanks for the info and help.

This makes an interesting study to see at what percentage underinflation from 
the Berto recommended pressures correlates with tire collapse. Looks like 25% 
so far.

But I still wonder if Berto chart applies on supple tires with wide rims, as I 
think I read a BQ blog post ttat stated he used stouter tires on narrower rims 
for his study.

@Steve:
I like the 700c. I'll probably, at some point, experiment with 650b but don't 
know if that will work well. But I'm keeping it 700c for now. It rides great.

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Re: Re: [RBW] Re: tire pressures

2016-09-15 Thread john . hawrylak

LungimsamI would use pressures between 100% and 75% of the calculated F/R pressures. There should be enough room to find a comfortabe pressure John HawrylakWoodstown NJ On 09/15/16, Lungimsam wrote: So then looks like 75psi front and rear would put me in the zone like the 45psi on the Bleriot would. Trouble is, last time I ran tires that high on a bike bike it made for some harsh riding.I have been thinking of a 650b conversion.The bb's of the Bleriot and Rambouillet are within .5cm of each other on these tires sets. Perhaps a 650b x 42 on the Rambouillet would get me close to that 24cm bb height. Same crank length as the Bleriot.-- You received this message because you are subscribed to a topic in the Google Groups "RBW Owners Bunch" group.To unsubscribe from this topic, visit https://groups.google.com/d/topic/rbw-owners-bunch/tzq57fP7SZA/unsubscribe.To unsubscribe from this group and all its topics, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com.To post to this group, send email to rbw-owners-bunch@googlegroups.com.Visit this group at https://groups.google.com/group/rbw-owners-bunch.For more options, visit https://groups.google.com/d/optout.

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