Matt Savage

I'll chime in... I ran mine tubeless at DD. 30psi front and rear, me 195#. They did excellent until I had a sloppy remount after the barriers and burped a bunch on the rear on Corsa Concept 1.2acr's. Limped to the pits, pumped it up to 40 to be safe, but my climbing traction suffered on the second climb, and I lost about 8 places in the mean time.

At 145 you should be able to run 30 or lower safely, I'd think. But I've never run tubes for CX before, so what do I know...?

Sent from Matt Savage's DynaTac 8000X...

On Sep 4, 2012, at 5:52 PM, Brooke Hoyer wrote:

> I suppose should clarify I was running them tubeless. Hit rim on the rear on a root in the canyon bottom on the first lap. Remembered to avoid it thereafter. Had some fold over on the front on the little pine tree turn between all the ball fields. Remembered I should take little weight of the front and later laps were no problem. Squishy on the pavement but tolerable.
>
> A lot of how low you can go depends on how you pilot the bike. There definitely is a too low point and equipment choice (tubular, tubeless, latex tubes) can help you flirt with that number with less risk of a pinch.
> --
> Sent from my Android phone with K-9 Mail. Please excuse my brevity.
>
> Todd Mobley wrote:
> Low 30's on clinchers sounds risky...I'm not that daring. I ran the PDXs last season with latex tubes (and did the same at David Douglas) but haven't gone below about 36 front/38 rear. I weigh about 190 nekkid. At David Douglas, that hard right-hand corner on the pavement in the far SW corner of the course felt squishy enough to make me pretty nervous, but I never bottomed and have never pinch-flatted with that setup.
>
> -Todd
>
> --
> Todd E. Mobley, PE, PTOE
> Principal
> Lancaster Engineering
> (503) 248-0313 phone
> (503) 248-9251 fax
>
>
> On Tue, Sep 4, 2012 at 4:49 PM, Josh Spivey wrote:
> I punctured them on Open Pros, but have not pinch flatted them. It was at Het Meer actually. I weighed 180 last season, and I was probably running closer to 45 in back and 40 in front. I ran that pressure for several races (sometime 50 in the back), until I switched over to Challenges.
>
> I believe the tubulars are manufactured by Tufo, and therefore would be very difficult to pinch flat.
>
> If you didnt pinch flat them either going down the single track (couple of roots in there) or coming off of that last hump before the finish, you could be safe? I bottomed out my Tufos every time on that last hump running somewhere in the low 30s. I weight 175 this season.
>
> Did you notice any bottoming out at David Douglas?
>
> josh
>
>
>
>
>
> On 9/4/12 4:29 PM, "Brooke Hoyer" wrote:
>
> Ran my PDXs at 30 or slightly less at David Douglas. I tip the scales at about 180. I was using Stan's 355 rims though and those tires pop on the bead with a reassuring pop.
>
> _______________________________________________
> OBRA mailing list
> obra@list.obra.org
> http://list.obra.org/mailman/listinfo/obra
> Unsubscribe: obra-unsubscribe@list.obra.org
>
>
> _______________________________________________
> OBRA mailing list
> obra@list.obra.org
> http://list.obra.org/mailman/listinfo/obra
> Unsubscribe: obra-unsubscribe@list.obra.org

Dan Anderson

Nope, didn't notice any bottoming out. Maybe I race 'light'. Ironically, I did pinch flat on them last night at 40psi when I was riding around the neighborhood. Wheelied up a curb, hit my rear wheel on the curb and BAM. But at David Douglas I didn't even notice them being squirrelly or overly soft. Weird.

________________________________
From: Josh Spivey
To: obra
Sent: Tuesday, September 4, 2012 4:49 PM
Subject: Re: [OBRA Chat] Clement PDX clinchers: how low can you go?

Re: [OBRA Chat] Clement PDX clinchers: how low can you go?
I punctured them on Open Pros, but have not pinch flatted them. It was at Het Meer actually. I weighed 180 last season, and I was probably running closer to 45 in back and 40 in front. I ran that pressure for several races (sometime 50 in the back), until I switched over to Challenges.

I believe the tubulars are manufactured by Tufo, and therefore would be very difficult to pinch flat.

If you didnt pinch flat them either going down the single track (couple of roots in there) or coming off of that last hump before the finish, you could be safe? I bottomed out my Tufos every time on that last hump running somewhere in the low 30s. I weight 175 this season.

Did you notice any bottoming out at David Douglas?

josh

On 9/4/12 4:29 PM, "Brooke Hoyer" wrote:

Ran my PDXs at 30 or slightly less at David Douglas. I tip the scales at about 180. I was using Stan's 355 rims though and those tires pop on the bead with a reassuring pop.
>
_______________________________________________
OBRA mailing list
obra@list.obra.org
http://list.obra.org/mailman/listinfo/obra
Unsubscribe: obra-unsubscribe@list.obra.org

Brooke Hoyer

I suppose should clarify I was running them tubeless. Hit rim on the rear on a root in the canyon bottom on the first lap. Remembered to avoid it thereafter. Had some fold over on the front on the little pine tree turn between all the ball fields. Remembered I should take little weight of the front and later laps were no problem. Squishy on the pavement but tolerable.

A lot of how low you can go depends on how you pilot the bike. There definitely is a too low point and equipment choice (tubular, tubeless, latex tubes) can help you flirt with that number with less risk of a pinch.
--
Sent from my Android phone with K-9 Mail. Please excuse my brevity.

Todd Mobley wrote:

Low 30's on clinchers sounds risky...I'm not that daring. I ran the PDXs last season with latex tubes (and did the same at David Douglas) but haven't gone below about 36 front/38 rear. I weigh about 190 nekkid. At David Douglas, that hard right-hand corner on the pavement in the far SW corner of the course felt squishy enough to make me pretty nervous, but I never bottomed and have never pinch-flatted with that setup.

-Todd

--
Todd E. Mobley, PE, PTOE
Principal
Lancaster Engineering
(503) 248-0313 phone
(503) 248-9251 fax

On Tue, Sep 4, 2012 at 4:49 PM, Josh Spivey wrote:

I punctured them on Open Pros, but have not pinch flatted them. It was at Het Meer actually. I weighed 180 last season, and I was probably running closer to 45 in back and 40 in front. I ran that pressure for several races (sometime 50 in the back), until I switched over to Challenges.

I believe the tubulars are manufactured by Tufo, and therefore would be very difficult to pinch flat.

If you didnt pinch flat them either going down the single track (couple of roots in there) or coming off of that last hump before the finish, you could be safe? I bottomed out my Tufos every time on that last hump running somewhere in the low 30s. I weight 175 this season.

Did you notice any bottoming out at David Douglas?

josh

On 9/4/12 4:29 PM, "Brooke Hoyer" wrote:

Ran my PDXs at 30 or slightly less at David Douglas. I tip the scales at about 180. I was using Stan's 355 rims though and those tires pop on the bead with a reassuring pop.

_______________________________________________
OBRA mailing list
obra@list.obra.org
http://list.obra.org/mailman/listinfo/obra
Unsubscribe: obra-unsubscribe@list.obra.org

Todd Mobley

Low 30's on clinchers sounds risky...I'm not that daring. I ran the PDXs
last season with latex tubes (and did the same at David Douglas) but
haven't gone below about 36 front/38 rear. I weigh about 190 nekkid. At
David Douglas, that hard right-hand corner on the pavement in the far SW
corner of the course felt squishy enough to make me pretty nervous, but I
never bottomed and have never pinch-flatted with that setup.

-Todd

--
Todd E. Mobley, PE, PTOE
Principal
Lancaster Engineering
(503) 248-0313 phone
(503) 248-9251 fax

On Tue, Sep 4, 2012 at 4:49 PM, Josh Spivey wrote:

> I punctured them on Open Pros, but have not pinch flatted them. It was
> at Het Meer actually. I weighed 180 last season, and I was probably running
> closer to 45 in back and 40 in front. I ran that pressure for several races
> (sometime 50 in the back), until I switched over to Challenges.
>
> I believe the tubulars are manufactured by Tufo, and therefore would be
> very difficult to pinch flat.
>
> If you didnt pinch flat them either going down the single track (couple
> of roots in there) or coming off of that last hump before the finish, you
> could be safe? I bottomed out my Tufos every time on that last hump running
> somewhere in the low 30s. I weight 175 this season.
>
> Did you notice any bottoming out at David Douglas?
>
> josh
>
>
>
>
>
> On 9/4/12 4:29 PM, "Brooke Hoyer" wrote:
>
> Ran my PDXs at 30 or slightly less at David Douglas. I tip the scales at
> about 180. I was using Stan's 355 rims though and those tires pop on the
> bead with a reassuring pop.
>
>
> _______________________________________________
> OBRA mailing list
> obra@list.obra.org
> http://list.obra.org/mailman/listinfo/obra
> Unsubscribe: obra-unsubscribe@list.obra.org
>
>

Josh Spivey

I punctured them on Open Pros, but have not pinch flatted them. It was at
Het Meer actually. I weighed 180 last season, and I was probably running
closer to 45 in back and 40 in front. I ran that pressure for several races
(sometime 50 in the back), until I switched over to Challenges.

I believe the tubulars are manufactured by Tufo, and therefore would be very
difficult to pinch flat.

If you didnt pinch flat them either going down the single track (couple of
roots in there) or coming off of that last hump before the finish, you could
be safe? I bottomed out my Tufos every time on that last hump running
somewhere in the low 30s. I weight 175 this season.

Did you notice any bottoming out at David Douglas?

josh

On 9/4/12 4:29 PM, "Brooke Hoyer" wrote:

> Ran my PDXs at 30 or slightly less at David Douglas. I tip the scales at about
> 180. I was using Stan's 355 rims though and those tires pop on the bead with a
> reassuring pop.

Shane Gibson

I ran them tubular glued on (with Belgium tape) to Corsa Concepts carbon
rims. Ran 30 psi front, 34 psi rear. I weigh 211.2 pounds. My bike
weighs 22.4 pounds. I was probably carrying and additional 5 to 8 pounds
between helmet, shoes, race kit, etc.

I felt like the front held the lines perfectly, didn't reach any point of
full rim compression, etc. The rear I had a few issues on extremely high
speed corners transitioning from pavement to grass, in a left turns - I
didn't experience this on any right turns. Sort of felt like the tubulars
were rolling off; only happened in the apex of the corners, when leaning
way over, at 18+ mph. After the race I checked the glue job and it appears
to be 100% - no areas where it's pealing away from the rim. Might have
only been the rear slipping out on the corner, and then the PDXs hooking
back up again. Hard to tell. I was beyond hypoxic ...

At no time did I feel like the rear was bottoming out on the rim either -
in fact it almost felt a little too stiff and bouncy - and I might consider
dropping the pressure a few psi ...

~~shane

--
"Opportunities multiply as they are seized." - Sun Tzu

On Tue, Sep 4, 2012 at 4:29 PM, Brooke Hoyer wrote:

> Ran my PDXs at 30 or slightly less at David Douglas. I tip the scales at
> about 180. I was using Stan's 355 rims though and those tires pop on the
> bead with a reassuring pop.
> --
> Sent from my Android phone with K-9 Mail. Please excuse my brevity.
>
>
> Dan Anderson wrote:
>>
>>
>> I weigh 145 & raced David Douglas on Clement PDX clinchers (CXP-22 rims)
>> at 30 psi front, 32 psi rear. Didn't pinch flat, but I'm guessing I'm
>> pretty much at the minimum pressure there. Anybody else run these
>> clinchers that low?
>>
>
> _______________________________________________
> OBRA mailing list
> obra@list.obra.org
> http://list.obra.org/mailman/listinfo/obra
> Unsubscribe: obra-unsubscribe@list.obra.org
>
>

Brooke Hoyer

Ran my PDXs at 30 or slightly less at David Douglas. I tip the scales at about 180. I was using Stan's 355 rims though and those tires pop on the bead with a reassuring pop.
--
Sent from my Android phone with K-9 Mail. Please excuse my brevity.

Dan Anderson wrote:

I weigh 145 & raced David Douglas on Clement PDX clinchers (CXP-22 rims) at 30 psi front, 32 psi rear. Didn't pinch flat, but I'm guessing I'm pretty much at the minimum pressure there. Anybody else run these clinchers that low?

Dan Anderson

I weigh 145 & raced David Douglas on Clement PDX clinchers (CXP-22 rims) at 30 psi front, 32 psi rear. Didn't pinch flat, but I'm guessing I'm pretty much at the minimum pressure there. Anybody else run these clinchers that low?