Delta 7 Ascend road bike review

Who cares about the bike…you rode with Liz Hatch and didn't get any pictures of that? You stink!!!

Who cares about the bike…you rode with Liz Hatch and didn't get any pictures of that? You stink!!!

Here you go, Ghost.

KWC has a better one.

Here you go, Ghost.KWC has a better one.

According to Delta 7, they performed wind tunnel tests on this frame expecting more wind resistance from all of the surfaces and they wanted to quantify just how bad the turbulence would be. There's indeed more drag because of all the flow through the lattices, but the drag induced by vortices behind the tubes completely disappears, resulting in a net benefit: the IsoTruss design results in less drag than conventional tubes. Thanks for the cover story. This piece about it being superior over conventional tubes as far as aero drag is concerned is all fluff in so far as they don't publish evidence backing up this claim. I have some hard time believing that a TT bike fitted with an Isotruss frame will outperform a top of the line Cervelo in a timed event.

I wrote extensively about this Isotruss structure and some of its advantages and disadvantages, particularly in the context of building a bike with it.

Intro to Isotruss Open Lattice StructureShortcomings

According to Delta 7, they performed wind tunnel tests on this frame expecting more wind resistance from all of the surfaces and they wanted to quantify just how bad the turbulence would be. There's indeed more drag because of all the flow through the lattices, but the drag induced by vortices behind the tubes completely disappears, resulting in a net benefit: the IsoTruss design results in less drag than conventional tubes. Thanks for the cover story. This piece about it being superior over conventional tubes as far as aero drag is concerned is all fluff in so far as they don't publish evidence backing up this claim. I have some hard time believing that a TT bike fitted with an Isotruss frame will outperform a top of the line Cervelo in a timed event. I wrote extensively about this Isotruss structure and some of its advantages and disadvantages, particularly in the context of building a bike with it.Intro to Isotruss Open Lattice StructureShortcomings

Ron: Regarding aero and TT bikes, that's precisely why I weasled out by mentioning "conventional tubes." Still, this bike is much more comfortable to ride than any TT bike.

Thanks for pointing to your earlier articles about Delta 7's application of iso truss structures to bikes. Yes, the bike is a little over the top and I've been skeptical of the design, but then I hopped on the bike and — wow, what a bike.

Regarding the 'cheese grater' look — the surface is smooth. You're not going to lose skin or catch clothing on this bike. Anybody who's looked at this bike knows this right away, so I'm puzzled about the 'cheese grater' claim.

Ron: Regarding aero and TT bikes, that's precisely why I weasled out by mentioning "conventional tubes." Still, this bike is much more comfortable to ride than any TT bike. Thanks for pointing to your earlier articles about Delta 7's application of iso truss structures to bikes. Yes, the bike is a little over the top and I've been skeptical of the design, but then I hopped on the bike and — wow, what a bike.Regarding the 'cheese grater' look — the surface is smooth. You're not going to lose skin or catch clothing on this bike. Anybody who's looked at this bike knows this right away, so I'm puzzled about the 'cheese grater' claim.

The Aerodynamic properties of the IsoTruss are directly proportional to the "solidity ratio" of the tube, or the percentage of open space-to-truss. For example, the larger the diameter of an IsoTruss, the less wind drag it has. Also, the distance from peak-to-peak on the IsoTruss will affect the density of the weave, thus affecting the drag coefficient. When you compare the IsoTruss tubes on the road bike to those on the mountain bike, you can see that the mountain tubes were optimized for strength-to-weight without any regard for aerodynamics. The mountain bike has a shorter peak-to-peak distance and some very small diameter IsoTrusses in the rear triangle, while the road bike was designed to strike more of a balance between strength, stiffness, weight, and aerodynamics. The peak-to-peak length is much more elongated and the IsoTruss members are thinner. That's one of the main reasons why the road bike has a "traditional" rear triangle instead of the IsoTruss rear triangle that the mountain bike has. At those small diameters, the IsoTruss would create more drag than the rearward vortex that it eliminates, so no net gain.

The road bike frame was tested at the "A2" wind tunnel in North Carolina, which is a highly respected aerodynamics laboratory both in the cycling industry as well as the NASCAR racing industry. As stated by the author, our hopes were not very high originally. we simply wanted to know how the bike compared to a conventional cylindrical tube frame to see if there was any aerodynamic penalty in the new design. The net result was that the Delta 7 bike had slightly less drag than the classic cylindrical tube frame, but the difference was only by a handfull of grams, so it was a pleasant surprise, but not worthy of a major marketing angle. Surely a frame built with an airfoil shape will be more aerodynamic, but the Delta 7 Ascend is not intended to be a time trial bike, but rather a swift nimble all-around bike with a tilt toward agressive climbing, cornering, and sprinting.

The Aerodynamic properties of the IsoTruss are directly proportional to the "solidity ratio" of the tube, or the percentage of open space-to-truss. For example, the larger the diameter of an IsoTruss, the less wind drag it has. Also, the distance from peak-to-peak on the IsoTruss will affect the density of the weave, thus affecting the drag coefficient. When you compare the IsoTruss tubes on the road bike to those on the mountain bike, you can see that the mountain tubes were optimized for strength-to-weight without any regard for aerodynamics. The mountain bike has a shorter peak-to-peak distance and some very small diameter IsoTrusses in the rear triangle, while the road bike was designed to strike more of a balance between strength, stiffness, weight, and aerodynamics. The peak-to-peak length is much more elongated and the IsoTruss members are thinner. That's one of the main reasons why the road bike has a "traditional" rear triangle instead of the IsoTruss rear triangle that the mountain bike has. At those small diameters, the IsoTruss would create more drag than the rearward vortex that it eliminates, so no net gain. The road bike frame was tested at the "A2" wind tunnel in North Carolina, which is a highly respected aerodynamics laboratory both in the cycling industry as well as the NASCAR racing industry. As stated by the author, our hopes were not very high originally. we simply wanted to know how the bike compared to a conventional cylindrical tube frame to see if there was any aerodynamic penalty in the new design. The net result was that the Delta 7 bike had slightly less drag than the classic cylindrical tube frame, but the difference was only by a handfull of grams, so it was a pleasant surprise, but not worthy of a major marketing angle. Surely a frame built with an airfoil shape will be more aerodynamic, but the Delta 7 Ascend is not intended to be a time trial bike, but rather a swift nimble all-around bike with a tilt toward agressive climbing, cornering, and sprinting.

IIRC, the Isogrid folks claim that you can take a pickup truck over the frame without breaking it.

IMHO, that's a better feature to sell me the bike on than aerodynamics…. but I don't claim to be a normal cyclist.

IIRC, the Isogrid folks claim that you can take a pickup truck over the frame without breaking it.IMHO, that's a better feature to sell me the bike on than aerodynamics…. but I don't claim to be a normal cyclist.

Wirehead: I remember a video about that from one of the titanium frame builders. It would be cool if Delta 7 has something like that

Wirehead: I remember a video about that from one of the titanium frame builders. It would be cool if Delta 7 has something like that

For a road bike, the advantages of iso-truss are moot. For an MTB, this is just a bad application. For the hefty price tag of the bike, it has not bothered to follow the trends in the market. Amateur riders may want to mess around with oil, and dirt all the time. We're in the age of belt drives, trying to slowly rout out the chains. And looks are everything down on the sales floor. Using the Isotruss on a muddy singletrack is going to be a cleaning nightmare. Unless you have your own washman, I don't see how anyone could enjoy wasting time plucking out leaves, flowers and mud from 'trusses', whatever the perceived advantage they may otherwise offer the rider maybe. There are plenty of all-round designs in the market without holes in them that are 'nimble', and aggressive without the price of an arm and a leg. Anything said about the aerodynamics of the bike is to be taken with a pinch of salt unless data is presented showing the effects of air at various angles. Maybe they should supplement their frames with a free cleaning rag and water hose.

For a road bike, the advantages of iso-truss are moot. For an MTB, this is just a bad application. For the hefty price tag of the bike, it has not bothered to follow the trends in the market. Amateur riders may want to mess around with oil, and dirt all the time. We're in the age of belt drives, trying to slowly rout out the chains. And looks are everything down on the sales floor. Using the Isotruss on a muddy singletrack is going to be a cleaning nightmare. Unless you have your own washman, I don't see how anyone could enjoy wasting time plucking out leaves, flowers and mud from 'trusses', whatever the perceived advantage they may otherwise offer the rider maybe. There are plenty of all-round designs in the market without holes in them that are 'nimble', and aggressive without the price of an arm and a leg. Anything said about the aerodynamics of the bike is to be taken with a pinch of salt unless data is presented showing the effects of air at various angles. Maybe they should supplement their frames with a free cleaning rag and water hose.

My brother and I are both former racers. There is a climb near our house that we have done many times, with 6-10 percent grades, and over 2,000 feet of climbing. I got a chance to demo the Ascend today. Despite the fact that we had to ride in the afternoon in 100 degree temps, and didn't have the tail wind we have had lately, I still beat my best time this year by over 1 minute 30 seconds. If I had gone in the morning with cooler temps, I have no doubt I would have gone at least another 30 seconds faster (the heat killed me). This bike is so stiff, it is unbelieveable! You get out of the saddle, and there is a transfer of power to the wheel that is like nothing I have ever felt. After reaching the top, my brother and I switched bikes, and did the last steep sections again. This time I was on his Specialized Rubaix with Dura Ace, and he was on the Ascend. The Rubaix felt like it had a flat tire by comparison. My brother could not believe the difference, and after 2 days of giving me crap for considering upgrading my bike, suddenly was trying to figure out how to afford one too. If you live in the mountains, don't try this bike unless you are ready to buy. It climbs like nothing else. Oh, and my bathroom scale said this incredible stiff bike only weighed 14.5 lbs with water bottle cage

My brother and I are both former racers. There is a climb near our house that we have done many times, with 6-10 percent grades, and over 2,000 feet of climbing. I got a chance to demo the Ascend today. Despite the fact that we had to ride in the afternoon in 100 degree temps, and didn't have the tail wind we have had lately, I still beat my best time this year by over 1 minute 30 seconds. If I had gone in the morning with cooler temps, I have no doubt I would have gone at least another 30 seconds faster (the heat killed me). This bike is so stiff, it is unbelieveable! You get out of the saddle, and there is a transfer of power to the wheel that is like nothing I have ever felt. After reaching the top, my brother and I switched bikes, and did the last steep sections again. This time I was on his Specialized Rubaix with Dura Ace, and he was on the Ascend. The Rubaix felt like it had a flat tire by comparison. My brother could not believe the difference, and after 2 days of giving me crap for considering upgrading my bike, suddenly was trying to figure out how to afford one too. If you live in the mountains, don't try this bike unless you are ready to buy. It climbs like nothing else. Oh, and my bathroom scale said this incredible stiff bike only weighed 14.5 lbs with water bottle cage

Yokota, FYI Delta 7 just launched a Facebook and Twitter account. They posted a link to your review. Feel free to post a few comments on the review or upload the video file. This info is really helpful and interesting for people to get a hold of. Also become a fan and suggest it to some friends to keep the conversation going. Cheers!Reviews tab: http://www.facebook.com/pages/edit/?id=123803596340#/pages/Payson-UT/Delta-7-Sports/123803596340?v=app_6261817190&viewas=537706172

Yokota, FYI Delta 7 just launched a Facebook and Twitter account. They posted a link to your review. Feel free to post a few comments on the review or upload the video file. This info is really helpful and interesting for people to get a hold of. Also become a fan and suggest it to some friends to keep the conversation going. Cheers!

Reviews tab: http://www.facebook.com/pages/edit/?id=123803596340#/pages/Payson-UT/Delta-7-Sports/123803596340?v=app_6261817190&viewas=537706172

Thank you Allison. Are you with SOAR?

Thank you Allison. Are you with SOAR?

I left the comment a few weeks ago where I mention how much faster I was climbing the hill near my house with my brother on the Delta 7. Since writing that comment, I demoed the Cervelo R3 for a weekend as well. I bought the Delta 7 last week! I believe that is what they call putting your money where your mouth is…. LOVE this bike!

I left the comment a few weeks ago where I mention how much faster I was climbing the hill near my house with my brother on the Delta 7. Since writing that comment, I demoed the Cervelo R3 for a weekend as well. I bought the Delta 7 last week! I believe that is what they call putting your money where your mouth is…. LOVE this bike!

Hi Rich, and thanks for that update.

Hi Rich, and thanks for that update.