Isaac Impulse arrived
#26
Senior Member
Joined: Apr 2007
Posts: 380
Likes: 0
From: New York
Bikes: 2007 Pedalforce RS full Dura-Ace Road Bike / 2006 Spezialized Sirrus Pro
I kinda agree with you about some of the generic frames as they can be as good of a bike. The one you posted is ok, I hate that carbon weave though. As far as the Isaac decals, they are one of the main reasons for why I like the look of the bike. Simple and understated.
The tubes on the Isaac are MASSIVE though and this frame is raced by professional teams which at least shows it is up to the challenge of racing. I am sure an generic company can make a frame that looks similar, but will likely weigh a significant amount more. I am impressed with Pedal Force's RS2 that a friend has because the weight is low.
The tubes on the Isaac are MASSIVE though and this frame is raced by professional teams which at least shows it is up to the challenge of racing. I am sure an generic company can make a frame that looks similar, but will likely weigh a significant amount more. I am impressed with Pedal Force's RS2 that a friend has because the weight is low.
#27
I eat carbide.


Joined: Jan 2006
Posts: 21,678
Likes: 1,417
From: Elgin, IL
Bikes: Lots. Chapter2, Van Dessel, Giant, Trek, etc Dealers for BMC, Chapter2
I kinda agree with you about some of the generic frames as they can be as good of a bike. The one you posted is ok, I hate that carbon weave though. As far as the Isaac decals, they are one of the main reasons for why I like the look of the bike. Simple and understated.
The tubes on the Isaac are MASSIVE though and this frame is raced by professional teams which at least shows it is up to the challenge of racing. I am sure an generic company can make a frame that looks similar, but will likely weigh a significant amount more. I am impressed with Pedal Force's RS2 that a friend has because the weight is low.
The tubes on the Isaac are MASSIVE though and this frame is raced by professional teams which at least shows it is up to the challenge of racing. I am sure an generic company can make a frame that looks similar, but will likely weigh a significant amount more. I am impressed with Pedal Force's RS2 that a friend has because the weight is low.
There is one that is still hanging up in the back of the shop waiting to be sent back because of a hairline crack in one of the stays. Happened in a Cat 1/2 pileup. Team captain's bike. He's a 190+lb Cat1. high speed pileup and he was at the bottom of the pile.
Looks ridable, but they went over it with a fine tooth comb for a hour until they spotted a shift in the light reflection and notice the 'crack'.
All of the rest have endured a lot of wrecks, etc with no problems.
They are beautiful bikes. I hate having to stare at them during trainer classes. The head tubes are f'n HUGE! Nothing like that factory frame shown. Isaacs are "their own" bike. These are not just run of the mill frames with Isaac slapped on them. They are actually engineered/designed. They are unique....ish...
They are amazingly light and the tubes do look masive in a lot of places. Much more than any other production bike I have seen.
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Last edited by Psimet2001; 12-18-08 at 09:39 PM.
#28
Thread Starter
Banned
Joined: Nov 2007
Posts: 1,457
Likes: 0
Bikes: Isaac Impulse, Litespeed Solano, Mongoose Bosberg, Trek 5500, (recently sold Litespeed Classic, Scott Speedster Flat bar)
My friend snagged a RS2 in a group buy last year and I have to say I am utterly impressed with what he got for a $450 frameset. Really nice and in the rare white/black finish. I am sure the ride quality is different on the Isaac because of the HUGE tubes which may be good and bad thing as I don't race. We will see but I am 185 lbs so I don't think it will be an issue.
#29
Thread Starter
Banned
Joined: Nov 2007
Posts: 1,457
Likes: 0
Bikes: Isaac Impulse, Litespeed Solano, Mongoose Bosberg, Trek 5500, (recently sold Litespeed Classic, Scott Speedster Flat bar)
This is good to hear. I read good reviews and Bicycling did a long term update article on the Impulse in August and they raved about it. I took this article seriously because Isaac isn't a big (if at all) advertiser so I take what the writer said seriously.
I recognize Isaac and others make and design their own frames, but the fit and finish on the Isaac at the dropouts isn't any better than on my Mongoose. Plus the decals on my Mongoose are under the clearcoat which is a nice touch. The ride will be a lot different though with the huge diameter tubes. We'll see.
I recognize Isaac and others make and design their own frames, but the fit and finish on the Isaac at the dropouts isn't any better than on my Mongoose. Plus the decals on my Mongoose are under the clearcoat which is a nice touch. The ride will be a lot different though with the huge diameter tubes. We'll see.
Our team shop is an Isaac shop. Our team bikes are Isaacs. The team has been racing them for at least 2 full seasons. They have all held up amazingly well.
There is one that is still hanging up in the back of the shop waiting to be sent back because of a hairline crack in one of the stays. Happened in a Cat 1/2 pileup. Team captain's bike. He's a 190+lb Cat1. high speed pileup and he was at the bottom of the pile.
Looks ridable, but they went over it with a fine tooth comb for a hour until they spotted a shift in the light reflection and notice the 'crack'.
All of the rest have endured a lot of wrecks, etc with no problems.
They are beautiful bikes. I hate having to stare at them during trainer classes. The head tubes are f'n HUGE! Nothing like that factory frame shown. Isaacs are "their own" bike. These are just run of the mill frames with Isaac slapped on them. They are actually engineered/designed. They are unique....ish...
They are amazingly light and the tubes do look masive in a lot of places. Much more than any other production bike I have seen.
There is one that is still hanging up in the back of the shop waiting to be sent back because of a hairline crack in one of the stays. Happened in a Cat 1/2 pileup. Team captain's bike. He's a 190+lb Cat1. high speed pileup and he was at the bottom of the pile.
Looks ridable, but they went over it with a fine tooth comb for a hour until they spotted a shift in the light reflection and notice the 'crack'.
All of the rest have endured a lot of wrecks, etc with no problems.
They are beautiful bikes. I hate having to stare at them during trainer classes. The head tubes are f'n HUGE! Nothing like that factory frame shown. Isaacs are "their own" bike. These are just run of the mill frames with Isaac slapped on them. They are actually engineered/designed. They are unique....ish...
They are amazingly light and the tubes do look masive in a lot of places. Much more than any other production bike I have seen.
#31
#33
Senior Member
Joined: Jul 2008
Posts: 1,152
Likes: 0
From: ABQ, NM
Bikes: Neuvation F100, Surly Cross Check, Van Dessel Holeshot
wait...Isaac Newton was super christian and wrote fairly extensively on biblical matters in his later life. By the transitive property, I believe you have yourself one religious frame.
#34
Senior Member
Joined: Apr 2007
Posts: 380
Likes: 0
From: New York
Bikes: 2007 Pedalforce RS full Dura-Ace Road Bike / 2006 Spezialized Sirrus Pro
what the hell. works for me.

can i still bring it to my favorite rides?
Last edited by Johannes; 12-19-08 at 03:36 AM.
#35
Sua Ku
Joined: Aug 2006
Posts: 5,705
Likes: 2
From: Hot as hell, Singapore
Bikes: Trek 5200, BMC SLC01, BMC SSX, Specialized FSR, Holdsworth Criterium
This is good to hear. I read good reviews and Bicycling did a long term update article on the Impulse in August and they raved about it. I took this article seriously because Isaac isn't a big (if at all) advertiser so I take what the writer said seriously.
I recognize Isaac and others make and design their own frames, but the fit and finish on the Isaac at the dropouts isn't any better than on my Mongoose. Plus the decals on my Mongoose are under the clearcoat which is a nice touch. The ride will be a lot different though with the huge diameter tubes. We'll see.
I recognize Isaac and others make and design their own frames, but the fit and finish on the Isaac at the dropouts isn't any better than on my Mongoose. Plus the decals on my Mongoose are under the clearcoat which is a nice touch. The ride will be a lot different though with the huge diameter tubes. We'll see.
- decals on top of clearcoat on a frame
- any Bicycling review that contained any negativity.
I love the look of the Isaac frame, disappointed they don't seem to pay attention to detail that I would expect
#36
Peloton Shelter Dog
Joined: Nov 2005
Posts: 90,508
Likes: 32
From: Chester, NY
Bikes: 2017 Scott Foil, 2016 Scott Addict SL, 2018 Santa Cruz Blur CC MTB
It does seem to me that Bicycling magazine raves about 90% of the bikes they review. Which does underscore my personal 'once you get over three grand none of it sucks' theory.
#37
Thread Starter
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Joined: Nov 2007
Posts: 1,457
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Bikes: Isaac Impulse, Litespeed Solano, Mongoose Bosberg, Trek 5500, (recently sold Litespeed Classic, Scott Speedster Flat bar)
Well,
As far as decals go, I assure you that many frames have some or all of their decals over clearcoat. My Trek 5500 is one example of decals over clearcoat.
As far as negative reviews, I have seen some negative reviews in magazines and online of some bikes. Like I said, Isaac doesn't advertise like the bigger companies and the article I referred to was a long term update and not some intial impression of the frame. Bottom line is whether I like it. I hated my Litespeed Vortex in 2002 which was supposed to be one of the "best" at the time.
I will be honest about the Isaac once I get it on the rode but it is a nice looking frame.
As far as decals go, I assure you that many frames have some or all of their decals over clearcoat. My Trek 5500 is one example of decals over clearcoat.
As far as negative reviews, I have seen some negative reviews in magazines and online of some bikes. Like I said, Isaac doesn't advertise like the bigger companies and the article I referred to was a long term update and not some intial impression of the frame. Bottom line is whether I like it. I hated my Litespeed Vortex in 2002 which was supposed to be one of the "best" at the time.
I will be honest about the Isaac once I get it on the rode but it is a nice looking frame.
#39
Sua Ku
Joined: Aug 2006
Posts: 5,705
Likes: 2
From: Hot as hell, Singapore
Bikes: Trek 5200, BMC SLC01, BMC SSX, Specialized FSR, Holdsworth Criterium
Well,
As far as decals go, I assure you that many frames have some or all of their decals over clearcoat. My Trek 5500 is one example of decals over clearcoat.
As far as negative reviews, I have seen some negative reviews in magazines and online of some bikes. Like I said, Isaac doesn't advertise like the bigger companies and the article I referred to was a long term update and not some intial impression of the frame. Bottom line is whether I like it. I hated my Litespeed Vortex in 2002 which was supposed to be one of the "best" at the time.
I will be honest about the Isaac once I get it on the rode but it is a nice looking frame.
As far as decals go, I assure you that many frames have some or all of their decals over clearcoat. My Trek 5500 is one example of decals over clearcoat.
As far as negative reviews, I have seen some negative reviews in magazines and online of some bikes. Like I said, Isaac doesn't advertise like the bigger companies and the article I referred to was a long term update and not some intial impression of the frame. Bottom line is whether I like it. I hated my Litespeed Vortex in 2002 which was supposed to be one of the "best" at the time.
I will be honest about the Isaac once I get it on the rode but it is a nice looking frame.
#42
Thread Starter
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Joined: Nov 2007
Posts: 1,457
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Bikes: Isaac Impulse, Litespeed Solano, Mongoose Bosberg, Trek 5500, (recently sold Litespeed Classic, Scott Speedster Flat bar)
#43
Thread Starter
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Bikes: Isaac Impulse, Litespeed Solano, Mongoose Bosberg, Trek 5500, (recently sold Litespeed Classic, Scott Speedster Flat bar)
Well, I stand corrected on at least my Isaac frame. The decals are under the clearcoat but I can feel the letters are raised but under the clearcoat. Whatever. My Trek has decals that are over the clearcoat.
#44
How much does it weigh?
Joined: Jul 2005
Posts: 3,427
Likes: 1
From: Weight Weenie on a budget.
Bikes: Lotus Fixed, Bianchi Virata 2004
....
Yeah... ummmm....
OH, SNAP!!!!
Literally.
Isaac is recalling all (yes, ALL) of their bikes and frames from 2004 to 2009. Yes, they're recalling the future... sorta like Total Recall and a trip to Mars while dealing with 3 breast'd women aliens. But not. Just as snappy though.
https://road.cc/content/news/1525-isa...004-2009-bikes
Yeah... ummmm....
OH, SNAP!!!!
Literally.
Isaac is recalling all (yes, ALL) of their bikes and frames from 2004 to 2009. Yes, they're recalling the future... sorta like Total Recall and a trip to Mars while dealing with 3 breast'd women aliens. But not. Just as snappy though.
https://road.cc/content/news/1525-isa...004-2009-bikes
#46
Senior Member

Joined: Nov 2003
Posts: 12,275
Likes: 6
From: SE Minnesota
Bikes: are better than yours.
Too funny. One week LR is saying Isaacs are overpriced and not meant to last long, the next he's buying one, and now another week passes and it turns out he was right the first time.
#47
Thread Starter
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Joined: Nov 2007
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Bikes: Isaac Impulse, Litespeed Solano, Mongoose Bosberg, Trek 5500, (recently sold Litespeed Classic, Scott Speedster Flat bar)
First, I am the first to agree that my Isaac is overpriced, but I got it for 30% off retail which is why I pulled the trigger. Just because I think a Pedal Force is a better value doesn't mean I want one. I like the aesthetics of my Isaac better.
As far a Pedal Force or my Mongoose being better than a pricier frame, yes it can be. My Mongoose is finished better than my Isaac but my Isaac will have a totally different ride quality. Would I pay almost $3k for the Isaace frameset? No, but I am gonna build that bike up for no more than $3200 which makes it a good value at the end of the day.
You seem to like to try to trap me in some contradiction, but I have said all along that I feel my Monoose is a better value but that doesn't mean I won't spend on a more expensive frame. I have owned 2 Rolexes for example that were no better than my Oris which costs less than 1/2 but the Rolexes had better resale value for me. But at the right amount of discount, I would buy any frame.
As far a Pedal Force or my Mongoose being better than a pricier frame, yes it can be. My Mongoose is finished better than my Isaac but my Isaac will have a totally different ride quality. Would I pay almost $3k for the Isaace frameset? No, but I am gonna build that bike up for no more than $3200 which makes it a good value at the end of the day.
You seem to like to try to trap me in some contradiction, but I have said all along that I feel my Monoose is a better value but that doesn't mean I won't spend on a more expensive frame. I have owned 2 Rolexes for example that were no better than my Oris which costs less than 1/2 but the Rolexes had better resale value for me. But at the right amount of discount, I would buy any frame.
Last edited by Lazyrider; 12-27-08 at 11:32 PM.
#48
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Bikes: Isaac Impulse, Litespeed Solano, Mongoose Bosberg, Trek 5500, (recently sold Litespeed Classic, Scott Speedster Flat bar)
Well, I am way ahead of you. I emailed Isaac 2 days ago and this is not an actual recall of the bike. It is to have owners bring their bikes into dealers to have fork steerer tube inspected. Certain stems and installation set ups have caused cracks in a handful of steerers. Too many spacers under stem which is an universal issue on all lightweight carbon steerers.
Could be an issue with fork but also in installation process but they are covering their *****. They are not replacing anything other than expander or forks that show damage.
I didn't build it yet so my fork is fine but they are issuing a new expander/compression plug as a precaution. I am buying Ritchey WCS Stem and Handlebars and was thinking of a WCS fork to match which is 90+ grams lighter than the Isaac fork.
So, thanks for the "gotcha" post, you proved nothing.
Could be an issue with fork but also in installation process but they are covering their *****. They are not replacing anything other than expander or forks that show damage.
I didn't build it yet so my fork is fine but they are issuing a new expander/compression plug as a precaution. I am buying Ritchey WCS Stem and Handlebars and was thinking of a WCS fork to match which is 90+ grams lighter than the Isaac fork.
So, thanks for the "gotcha" post, you proved nothing.
#50
Batüwü Creakcreak
Joined: Jan 2007
Posts: 20,802
Likes: 294
From: The illadelph
Well, I am way ahead of you. I emailed Isaac 2 days ago and this is not an actual recall of the bike. It is to have owners bring their bikes into dealers to have fork steerer tube inspected. Certain stems and installation set ups have caused cracks in a handful of steerers. Too many spacers under stem which is an universal issue on all lightweight carbon steerers.
Could be an issue with fork but also in installation process but they are covering their *****. They are not replacing anything other than expander or forks that show damage.
I didn't build it yet so my fork is fine but they are issuing a new expander/compression plug as a precaution. I am buying Ritchey WCS Stem and Handlebars and was thinking of a WCS fork to match which is 90+ grams lighter than the Isaac fork.
So, thanks for the "gotcha" post, you proved nothing.
Could be an issue with fork but also in installation process but they are covering their *****. They are not replacing anything other than expander or forks that show damage.
I didn't build it yet so my fork is fine but they are issuing a new expander/compression plug as a precaution. I am buying Ritchey WCS Stem and Handlebars and was thinking of a WCS fork to match which is 90+ grams lighter than the Isaac fork.
So, thanks for the "gotcha" post, you proved nothing.
But for you it turns out that it's probably going to be a non issue, they'll give you a new fork, or tell you what to use (probable in this case). In any event, you don't really lose out on anything, so good for you.
I wasn't trying to prove anything, but I'm not quite sure why you're being so defensive...
Glad this is going to work out for ya.







