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Can't get beyond 100 psi with Topeak RaceRocket pump

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Can't get beyond 100 psi with Topeak RaceRocket pump

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Old 07-29-16, 10:20 AM
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johnlink
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Can't get beyond 100 psi with Topeak RaceRocket pump

Although the Topeak RaceRocket HP pump is rated for 160 psi, I haven't been able to use it to fill my 700x25 Continental Gatorskins (maximum pressure 120 psi) to more than 100 psi. As I continue to pump after I've reached 100 psi, I can tell that I'm moving air and there is normal resistance to the pumping, but the tire does not get any harder. I reported this to Topeak and was told that I needed to replace the pump, which was still under the 2-year warranty. The replacement RaceRocket arrived yesterday but I'm still unable to fill the tire beyond 100 psi. Do any of you have relevant experience with this pump?

Topeak® Cycling Accessories ? Products - RaceRocket HP, black

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Old 07-29-16, 11:39 AM
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I Like My Silca Pista Pump ... get a Track pump for the House .. On The Bike, I have a Frame Fit Silca Impero ....

getting up 100+ PSI is a lot of Work
no way around it .. it takes a lot of strokes to compress 14 psi (1bar) Air to reach 100psi.

even worse when you have a super short , jersey pocket, Pump.

since you cannot tell .. Buy a Separate gage for the P/V stem type .

and a Longer, frame fit, Pump.
the mini floor pump types that also come from Topeak have fans of them



./.

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Old 07-29-16, 11:42 AM
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Old 07-29-16, 12:00 PM
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I have the Topeak Race Rocket HP, but none of my tires are recommended for inflation above 90 psi.

Even with my old long stroke Zefal frame pump it was almost impossible to inflate my road bike tires above 90 psi. For that you really need a good floor pump.

And with skinny, low volume, high pressure tires, it's hard to check the pressure without losing air, which sets you back with every effort to be precise.
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Old 07-29-16, 12:27 PM
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You're really using the wrong tool for the job. Small pumps like that are made to get you home, not for normal airing up of your tires.
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Old 07-29-16, 12:34 PM
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Originally Posted by corrado33 View Post
You're really using the wrong tool for the job. Small pumps like that are made to get you home, not for normal airing up of your tires.
^This.
I take the pressure claims for portable pumps just as seriously as I take promises from politicians running for election.
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Old 07-29-16, 12:35 PM
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Any pump like that you want to use to get > 100 psi, needs to have the foldout base and a soft hose to attach to the valve really.

Such as:

https://www.amazon.com/Topeak-Road-M.../dp/B000FI6YOS

Even reading the reviews on that one, people say they have a hard time > 90.
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Old 07-29-16, 12:50 PM
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I have a 10 year old Silca Pump. Bite your lip and get one. If you can find one used, all the parts are available to rebuild it. I had no issues getting to 120 psi when I rode on 23's. My wife was even able to get to 120 psi without trouble.
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Old 07-29-16, 12:55 PM
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It's very difficult to get to 100 psi with those short pumps. Using my Mini Morph, with the end resting on the ground, it takes over 200 strokes to get to about 90 psi, and by then I'm leaning into the handle with all my upper body weight.

But even 70 or 80 psi is enough to finish a ride. The tiny pumps are certainly easy to carry. For fast inflation and high pressures, you need a long barrel.
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Old 07-29-16, 01:06 PM
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Oh, also, with the Topeak Race Rocket, be sure you've set the Schrader/Presta adapter correctly. It can be discombobulated fairly easily. Happened to me a few months ago. I didn't notice it switched from Schrader to Presta. It managed to get the tube up to around 15-20 psi but then became almost impossible to pump. Thought the pump had gone bad. In retrospect I'm surprised it worked at all, but it managed to force the spring loaded valve out of the way just with air pressure, before it couldn't overcome the back pressure resistance.
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Old 07-29-16, 02:38 PM
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For all of you suggesting I get a floor pump or that I'm using the wrong tool: I have a floor pump that I use at home but which, of course, I will not take on the road. The RaceRocket HP pump is for use on the road, for either day trips or overnight trips, and not for at home. And I am able to pump to 100 psi with the RaceRocket HP pump.
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Old 07-29-16, 02:51 PM
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Originally Posted by johnlink View Post
For all of you suggesting I get a floor pump or that I'm using the wrong tool: I have a floor pump that I use at home but which, of course, I will not take on the road. The RaceRocket HP pump is for use on the road, for either day trips or overnight trips, and not for at home. And I am able to pump to 100 psi with the RaceRocket HP pump.
You're probably fine with only having 100psi in 25c tires, even if you're quite heavy.
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Old 07-29-16, 03:06 PM
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Originally Posted by johnlink View Post
For all of you suggesting I get a floor pump or that I'm using the wrong tool: I have a floor pump that I use at home but which, of course, I will not take on the road. The RaceRocket HP pump is for use on the road, for either day trips or overnight trips, and not for at home. And I am able to pump to 100 psi with the RaceRocket HP pump.
Sorry but even on the road, if you NEED to get to 1## PSI, then you still need to bring a better pump. The only time I can see this being an issue is if you're touring. If that's the case then you have plenty of room to strap an actual, capable pump to the bag somewhere.

If you really need to, go with CO2 cartridges. They can easily get tires to pressures much higher than what you need.
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Old 07-29-16, 03:07 PM
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Originally Posted by SpeshulEd View Post
You're probably fine with only having 100psi in 25c tires, even if you're quite heavy.
I'm 163 and my bike is about 25.
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Old 07-29-16, 03:43 PM
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Originally Posted by johnlink View Post
I'm 163 and my bike is about 25.
Geeze you run your tires high.

I'm 155 and run my 25s at 75-85 PSI. Have never had a pinch flat.
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Old 07-29-16, 05:55 PM
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100 lbs. will get you home. I wouldn't expect any more from a miniature pump.

If you need higher pressure, a CO2 will work. But then without a gauge your guessing at your pressure.

I carry CO2s simply for the convience. They have always got me (or my buddies) home.
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Old 07-29-16, 06:31 PM
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Originally Posted by deapee View Post
Any pump like that you want to use to get > 100 psi, needs to have the foldout base and a soft hose to attach to the valve really.

Such as:

https://www.amazon.com/Topeak-Road-M.../dp/B000FI6YOS

Even reading the reviews on that one, people say they have a hard time > 90.
i think most responders to the OP are missing the fact that he's not saying he can't pump any more due to the pressure. He said he can pump, but the tire isn't getting any harder (the psi stops increasing in the tire). If a pump is rated as supposedly able to go to 160psi, and if the user can indeed pump, but the tire isn't inflating any more, then it's a flaw with the pump.
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Old 07-29-16, 07:27 PM
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Originally Posted by Sy Reene View Post
i think most responders to the OP are missing the fact that he's not saying he can't pump any more due to the pressure. He said he can pump, but the tire isn't getting any harder (the psi stops increasing in the tire). If a pump is rated as supposedly able to go to 160psi, and if the user can indeed pump, but the tire isn't inflating any more, then it's a flaw with the pump.
Oh yeah, good call...maybe the new one isn't exhibiting the same issues? Some clarification may be needed there.
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Old 07-29-16, 08:21 PM
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Originally Posted by deapee View Post
Oh yeah, good call...maybe the new one isn't exhibiting the same issues? Some clarification may be needed there.
Indeed, since the OP is also implying he's able to tell there's a problem by not noticing the tire getting any harder. I'm not sure I could tell by feel the diff between 100 and 120 psi in a 25mm tire.
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Old 07-29-16, 10:08 PM
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Originally Posted by deapee View Post
Any pump like that you want to use to get > 100 psi, needs to have the foldout base and a soft hose to attach to the valve really.

Such as:

https://www.amazon.com/Topeak-Road-M.../dp/B000FI6YOS

Even reading the reviews on that one, people say they have a hard time > 90.
No, it just needs to be a full sized frame pump. Silcas and Zephal HPs were getting race tires to full pressures 40 years ago. The only pumps I owned and used through my racing days were the HPs that lived on my bikes. I lent one to a skinny 45 yo classic bike geek build TTer to put 120 psi in his tires before a TT. He did it with no trouble. Nowadays the HPX is even easier.

That bikes now do not come with an easy means to carry a full frame pump is a combination of marketing and a market that accepts life on the road without a good pump. I leave those bikes in the shop window and ride with a full pump under the top tube on all my bikes.

I did buy a floor pump 25 years ago, then a nicer one 10 years ago. They save time and effort, but are hardly essential.

Ben
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Old 07-29-16, 10:22 PM
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The critical factor in pump pressure limits is the compression ratio, meaning the difference in internal volume between the extended and closed positions. The "dead air" space in that closed position not only lowers the compression ratio, but represents wasted effort on your part, because you have to recompress it on every stroke, even though it never enters the tire.
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Old 07-30-16, 04:18 AM
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Consider stopping at 90. You may find the ride more comfortable, with no downside.
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Old 07-30-16, 05:58 AM
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Overnight maybe; but obsessing over your tire pressure (100 psi no less) to this point on day trips?
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Old 07-30-16, 06:25 AM
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I have the RR HP too and I have pumped tires to over 120psi. I don't ride with them that high - just wanted to test the pump.
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Old 07-31-16, 08:28 AM
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I've found that a good solution is to carry 1 CO2 cartridge, an air chuck and a mini pump.
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