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-   -   Interesting finds around the web (https://www.bikeforums.net/showthread.php?t=929230)

queerpunk 09-11-17 08:40 AM


Originally Posted by brawlo (Post 19853694)
Looking at the amount of padding or tape on those top "bars" I'm going to guess it's a bike that was used for long sessions of aero testing. The bars may be to rest the shoulders/chest on so as the position can be dialed in without fatigue affecting it too badly and the rider getting sloppy with position

that's a good hypothesis. the whole bike seems designed around quick changes to position. can't tell about the stem, but it seems like the height of the bars can be easily changed, and the overall reach can be changed with two hex bolts. definitely a lot less work than playing with different bike sizes, changing stems, looking for different angles, etc.

seau grateau 09-11-17 04:45 PM

As it sits in the picture, it seems like the rider would need go-go Gadget arms to ride it.

700wheel 09-11-17 05:13 PM

Looks like riders might end up with bruised inner legs from the big top tube if the bike was rideable.

TDinBristol 09-12-17 07:48 AM

2 Attachment(s)

Originally Posted by 700wheel (Post 19855263)
Looks like riders might end up with bruised inner legs from the big top tube if the bike was rideable.

It's a bike built to be used in either of the "Obree positions." Unbolt the front bars and shorten the top tube with the telescoping device, and you get the Obree "ski racer" position. Unbolt the top bars and lengthen the top tube and you have the "Superman" position. Both positions are now banned:

queerpunk 09-12-17 08:06 AM

But the bars on the top tube can't steer the bike.

TDinBristol 09-12-17 08:13 AM


Originally Posted by queerpunk (Post 19856217)
But the bars on the top tube can't steer the bike.

I'd guess there's a steering link that would set up somehow with the front of the fork - when the TT is shorter they would line up in a straight line. But there'd have to be some kind of rotation from the top bars.

700wheel 09-13-17 12:13 PM

I found this photo of an overgrown Velodrome. Anyone know where it is?
http://2.bp.blogspot.com/-4VelnfS9uT...odromejax1.JPG

topflightpro 09-13-17 12:22 PM

Jacksonville, Fla. https://www.facebook.com/JacksonvilleVelodrome/

http://jacksonville.com/sports/outdo...side-velodrome

http://www.gravelcyclist.com/trainin...me-ride-video/

bitingduck 09-13-17 09:59 PM

LA 2028 is now official

Rumors are that they plan to build a new velodrome for it that doesn't have pillars interrupting the sight lines. It's not obvious if it would be a third LA track or replace one of the existing ones.

carleton 09-14-17 08:34 AM


Originally Posted by bitingduck (Post 19860437)
LA 2028 is now official

Rumors are that they plan to build a new velodrome for it that doesn't have pillars interrupting the sight lines. It's not obvious if it would be a third LA track or replace one of the existing ones.

Congrats!...and I'm sorry (hahaha)

The new athletic and housing facilities will be worth the temporary headache of the increased tourist traffic. Getting in and out of Atlanta was a huge PITA in 1996, but it was worth it.

topflightpro 09-14-17 10:04 AM


Originally Posted by carleton (Post 19861050)
Congrats!...and I'm sorry (hahaha)

The new athletic and housing facilities will be worth the temporary headache of the increased tourist traffic. Getting in and out of Atlanta was a huge PITA in 1996, but it was worth it.

You know, I don't remember it being that bad. I took a trip out of town during the week, and Hartsfield wasn't too awful.

I did get a little lost driving home from the Olympic Park the night of the bombing, I was there an hour prior. This was before cell phones and my mother was at home freaking out. I didn't know anything had happened until I got home, which was well after my allowed curfew.

700wheel 09-14-17 10:20 AM


Originally Posted by bitingduck (Post 19860437)
LA 2028 is now official

Rumors are that they plan to build a new velodrome for it that doesn't have pillars interrupting the sight lines. It's not obvious if it would be a third LA track or replace one of the existing ones.

My guess is that the StubHub Center Velodrome will be used as proposed by LA
https://la.curbed.com/2016/2/18/1108...-2024-ucla-bid
As I read somewhere Paris and LA being the sole bidders they are able to make demands on the IOC rather than visa versa.
Maybe the track will need resurfacing before 2028.
Unfortunately not much room to add bleachers.

It would be nice if USAC members could have first choice on tickets.

By the way I lived in the LA area during the 84 Olympics. The 7-11 track was close to my home and work place but had no problem traveling around LA on business as long as one avoided rush hour. The 84 game venues were located over a very wide area. Of course traffic has got heavier since 84.

rensho3 09-14-17 10:31 AM


Originally Posted by bitingduck (Post 19860437)
LA 2028 is now official

Rumors are that they plan to build a new velodrome for it that doesn't have pillars interrupting the sight lines. It's not obvious if it would be a third LA track or replace one of the existing ones.

I have heard that they intend to demolish the building surrounding the track and enlarge it. It is not clear whether the track itself will be preserved or replaced. In any case, its 11 years from now, so anything is possible.

topflightpro 09-14-17 10:49 AM


Originally Posted by 700wheel (Post 19861313)
It would be nice if USAC members could have first choice on tickets.

Pretty sure first dibs are going to big corporate sponsors.

bitingduck 09-14-17 02:52 PM


Originally Posted by 700wheel (Post 19861313)
My guess is that the StubHub Center Velodrome will be used as proposed by LA
https://la.curbed.com/2016/2/18/1108...-2024-ucla-bid
As I read somewhere Paris and LA being the sole bidders they are able to make demands on the IOC rather than visa versa.
Maybe the track will need resurfacing before 2028.

Given that it's in a temp and humidity controlled building, it will likely still be in pretty good shape. Maybe a light sanding.


Unfortunately not much room to add bleachers.
According to various things I heard when it opened, I thought the layout supported adding another 1000 or so temporary seats for spectators.


It would be nice if USAC members could have first choice on tickets.
If by tickets you mean "opportunities to volunteer to make things run" that's probably true. Event tickets with seats will be another thing altogether.


The 84 game venues were located over a very wide area. Of course traffic has got heavier since 84.
I live far from the velodrome and if I'm still here in 2028 would have no trouble missing the impact of the games entirely, even though it's likely that there will be a lot going on a few miles away from me at the Rose Bowl.

gycho77 09-22-17 08:39 PM

Arofly, the worlds's smallest power meter? | VeloNews.com

sarals 09-23-17 12:50 PM

Opinions?

Blue Competition Cycles-LEHIGH

carleton 09-23-17 06:10 PM


Originally Posted by sarals (Post 19882076)

Integrated Rotor BSA bottom BB30 bracket pretty much limits your crank options to....Rotor, Rotor, and Rotor. Not sure why they did that.

https://i.imgur.com/U8vxYCT.jpg

Jeebus...when will bike manufacturers stop with seatposts like this.

https://i.imgur.com/PDLvPl9.png

These have been shown to consistently either:

- Slip downward into seat tube,
- Slide backwards on the rail up top, and/or
- The single-bolt friction pivot point will allow the nose to tilt downward when "on the rivit" during hard efforts.


It's like this bike was designed in 2010 :roflmao2:

rustymongrel 09-24-17 06:52 AM

huh? says pretty clearly the frame is BSA threaded, maybe there was a mistake and they changed it.

As for the seatpost, I don't think there's anything wrong with that head design. If there was these guys wouldn't be using an identical system:

https://i.ytimg.com/vi/tfb8ANBom0w/hqdefault.jpg

carleton 09-24-17 09:54 AM


Originally Posted by rustymongrel (Post 19883148)
huh? says pretty clearly the frame is BSA threaded, maybe there was a mistake and they changed it.

As for the seatpost, I don't think there's anything wrong with that head design. If there was these guys wouldn't be using an identical system:

https://i.ytimg.com/vi/tfb8ANBom0w/hqdefault.jpg

Serenity and Felt also had that system...and both had well-known seatpost issues. Felt dealt with the tilting by switching seat mast toppers twice (for 3 total) and settled on an indexed seat mast topper.

The T5GB topper system is not identical to the Blue.

Notice that the Blue has a single bolt that goes horizontally across the seat mast to hold the assembly together with friction. The GB Cervelos do not. The T5GB uses a 2-bolt system like Thomson that use opposing force.

https://i.imgur.com/MHKSguS.png

Yeah, the Cervelo has the rail system which doesn't really solve a problem that trackies have. That system is popular on road TT bikes where the saddle setback rules are...well, there are none. A 74 degree seat tube angle and long saddle rails are adjustment enough for track racing.

carleton 09-24-17 09:56 AM

And also, who says that Team GB doesn't have issues with them? I know first hand of Team USA riders that had the afforemetioned issues with the Felts and still rode them in world-level competition...and were pissed every time it slipped on them.

rustymongrel 09-24-17 10:45 AM

The sliding head system is fairly necessary since on those bikes since the seatpost travels near vertically so as you adjust it up and down the effective seattube angle changes.

The serenity system looks similar but different. The Blue appears to use the same Ritchey one bolt head design that Cervélo uses on the production T4 and P-series bikes which was introduced to alleviate seatpost head slip with a previous design. I haven't heard of any issues with that Ritchey system which is actually saying something since my job is literally to receive complaints like that.

It does appear that team GB are using a slightly different clamp that attaches to post the same way. It could just be insurance since they know they won't need to make many adjustments once they've been fit on the bike. It could also be that they've had issues with the normal production head that the general population of T4 and P-series riders haven't.

sarals 09-24-17 12:21 PM

[MENTION=34156]carleton[/MENTION], maybe all of those design "flubs" are why the thing is only $1600 complete.

I'm toying with the idea of a pursuit bike for next season to go along with my Giant. The Blue looked intriguing because it is CHEAP, it has what appear to be decent wheels, a decent crankset (and it's 144 BCD so different maker's chainrings could be used), a decent cockpit, and decent geometry. I did notice the seatpost, though, and it made me wonder. Which is why I posted it with the remark "opinions". I was pretty sure I'd get a good set of responses about it.

gycho77 09-24-17 01:04 PM

A carbon expert in San Diego said he fixed aero seatpost slipping. He also said BT frames and his frames don't have any problems with seatpost slipping. So it's possible that GB team track frames(not cervelo) wouldn't have problems with seatpost slipping

sarals 09-24-17 01:38 PM

Speaking of Cervelo's and slipping saddles...




jsk 09-24-17 03:12 PM

I looked at the Lehi early last summer, the sale price was tempting but the geometry was no good (for me) for pursuit. I do have their TT/Tri bike, the Triad SL. The saddle clamp on that bike uses two bolts to adjust tilt and secure the saddle, never had any problems with it, seems to be a good design (definitely better than the clamp on the Cervelo S3 I've ridden). Can't tell from the Lehi pictures how similar/different the clamp is on that bike, though.

As far as carbon aero seatposts, I've owned three bikes with them and have never had a problem with them slipping. So I don't know if that's a problem unique to the track world or if trackies just don't know how to use carbon paste. :)

rustymongrel 09-24-17 04:08 PM

Post in frame slip is simply an issue of contact between the two. It's difficult for manufacturers to get tight tolerances with non-round carbon parts like that. Very liberal use of carbon assembly paste and making sure to tighten the wedge clamp to the proper torque (or even a little extra) makes a big difference on these types of frames/posts. Sometimes it just doesn't solve the problem though.

carleton 09-24-17 06:03 PM

(I'll reply to the other comments in a sec.)

Basically, the aero gains from the aero post over a round post don't justify the risk. Period. Especially with budget frames that have lower quality control than manufacturers like LOOK and BT.

Of all of the equipment and rider, the frame provides the least amount of aero gains. Further, the air coming into and behind the seatpost is so "dirty" due to the legs churning like pistons that the tapered backside that an aero seatpost has over a round one isn't significant...or probably not even measurable.

With that being said, at this point, an aero seatpost is pretty much cosmetic.

So, that leaves us with a proprietary (read: gotta buy replacements from the manufacturer) device that can lead to a race-losing failure.

Why bother?

carleton 09-24-17 07:20 PM


Originally Posted by rustymongrel (Post 19883485)
The sliding head system is fairly necessary since on those bikes since the seatpost travels near vertically so as you adjust it up and down the effective seattube angle changes.

The serenity system looks similar but different. The Blue appears to use the same Ritchey one bolt head design that Cervélo uses on the production T4 and P-series bikes which was introduced to alleviate seatpost head slip with a previous design. I haven't heard of any issues with that Ritchey system which is actually saying something since my job is literally to receive complaints like that.

It does appear that team GB are using a slightly different clamp that attaches to post the same way. It could just be insurance since they know they won't need to make many adjustments once they've been fit on the bike. It could also be that they've had issues with the normal production head that the general population of T4 and P-series riders haven't.

Regarding vertical seatpost: The first generation of the Felt TK1 came with two seatposts one with a normal setback clamp and the other with a much more forward clamp. I thought that was brilliant. I assume that this is from the Felt DA from which the TK1 seems to be modeled.

Forward seatpost option:
http://tsutaoka.com/wp-content/uploa...4/Felt-TK1.jpg

Setback seatpost option:
http://autobus.cyclingnews.com/photo...0110123523.jpg

That would easily solve that issue for Cervelo as well. People have been buying straight or setback seatposts for decades to address the same problem. I have both styles of Thomson seatposts for that same reason, and I'd rather have 2 that one with a sliding rail.

That first gen seatpost for the TK1 had a different issue, though. It was a "traditional" aero seatpost, not like the current dead-stop post on the TK1 today. It was also traditional in that it slipped down into the frame.


Originally Posted by sarals (Post 19883641)
[MENTION=34156]carleton[/MENTION], maybe all of those design "flubs" are why the thing is only $1600 complete.

I'm toying with the idea of a pursuit bike for next season to go along with my Giant. The Blue looked intriguing because it is CHEAP, it has what appear to be decent wheels, a decent crankset (and it's 144 BCD so different maker's chainrings could be used), a decent cockpit, and decent geometry. I did notice the seatpost, though, and it made me wonder. Which is why I posted it with the remark "opinions". I was pretty sure I'd get a good set of responses about it.

"Cheap" and "Inexpensive" are different things. I prefer inexpensive :D

Not to say that the Blue is cheap. The Blue bikes that I've seen were well-made.

Sarals, I recall you being a shorter rider. You may not weigh enough or make enough force for these things to matter. That being said, I've seen small riders wrestle with Serenity posts.


Originally Posted by sarals (Post 19883760)
Speaking of Cervelo's and slipping saddles...

https://www.youtube.com/watch?v=r5NFGV0aLY4&t=501s

I think she broke the clamp when she flopped back on to the saddle after the bike throw. I've seen 2 saddles fall off on the track in person. It's definitely a thing that happens. This is why I like strong seatposts and the related parts.

sarals 09-24-17 09:58 PM

[MENTION=34156]carleton[/MENTION], I am a smaller rider, yes. I don't make the kind of power that would pull my cleats out of my pedals, either. ;)

I completely understand "cheap" vs. "inexpensive". And I agree with you! I've seen an aluminum Blue track bike, my training partner has an older one, and it seems quite nice. I've never seen one of their carbon offerings.


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