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Search: Posts Made By: Turbotandem
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07-23-18, 07:49 AM
Replies: 8
Views: 3,206
Posted By Turbotandem

David provided the best outline; we leaned on him...

David provided the best outline; we leaned on him to hit the criteria we set. As you say, boost cranks are a hurdle we did not want to accept. In fact, we wanted a narrower Q-factor than we have on...
07-16-18, 12:54 PM
Replies: 8
Views: 3,206
Posted By Turbotandem

I added frame development pictures to first post,...

I added frame development pictures to first post, and here are some detail shots:...
07-16-18, 12:42 PM
Replies: 8
Views: 3,206
Posted By Turbotandem

I played with the shifter location for a month...

I played with the shifter location for a month before settling (and before finishing the leather wraps that essentially lock in the set up). I could not find a good location that could be controlled...
07-15-18, 05:22 PM
Replies: 8
Views: 3,206
Posted By Turbotandem

Bikepacking Gravel Tandem Project

Fresh off an inaugural two week back country ride across gravel and forest service roads thru Colorado on our new tandem, I wanted to share our latest tandem build in case the details help others...
11-27-17, 08:43 AM
Replies: 81
Views: 16,573
Posted By Turbotandem

Originally I had a small tool tube in hat...

Originally I had a small tool tube in hat position, but prior to tour divide made a bracket to lower the cage. In the shop picture the down tube is already lowered, and in the picture at the cabin...
11-23-17, 06:47 PM
Replies: 81
Views: 16,573
Posted By Turbotandem

Bags are bolt-on by Jpak, local to me in...

Bags are bolt-on by Jpak, local to me in Colorado. Just a few pieces of Velcro. Bolts are using some water bottles plus extra we coordinated between frame builder and Jpak.
11-22-17, 12:39 PM
Replies: 81
Views: 16,573
Posted By Turbotandem

The frame bag is two parts. For tour...

The frame bag is two parts. For tour divide-Colorado we managed to stay at accommodations each night so we did not have the lower "camping" bag. But did have a full-stuffed handle bar bag. We carried...
11-22-17, 10:09 AM
Replies: 81
Views: 16,573
Posted By Turbotandem

Here's an update with pictures of our gravel...

Here's an update with pictures of our gravel tandem "in the wild". Now configured for bike-packing with 7 bottles (for routes with water harvesting I prefer bottles over bladders and also for getting...
03-19-17, 11:43 PM
Replies: 81
Views: 16,573
Posted By Turbotandem

For the 10 minutes in Tasshi's shop, and...

For the 10 minutes in Tasshi's shop, and insisting he take at least money to get the kids ice cream for his time; yes the 3mm reduction hits the mark for the gravel tandem with the "road" 68mm BB...
03-12-17, 08:33 PM
Replies: 440
Views: 111,337
Posted By Turbotandem

My rotors have hit 800-1,000 degrees. With...

My rotors have hit 800-1,000 degrees. With organic pads I'd not think the more distant calipers would be over 500f. I'd assume 450f loctite is good.
03-05-17, 08:07 PM
Replies: 440
Views: 111,337
Posted By Turbotandem

My hope rotor always had issues with the hope...

My hope rotor always had issues with the hope "rivets" grazing the the caliper body. I stopped trying to get the hope rotor to work a few years ago and haven't tried with any newer TRP bodies, so...
02-28-17, 09:39 PM
Replies: 114
Views: 21,480
Posted By Turbotandem

FD slim mount

Thanks for the research and helping with my modification to the FD mount. I've posted pictures of this work in my gravel tandem project here: http://www.bikeforums.net/19410211-post71.html
The...
02-28-17, 09:34 PM
Replies: 81
Views: 16,573
Posted By Turbotandem

modified FD mount

Based on direction from Twocicle's post http://www.bikeforums.net/19079472-post79.html and direct correspondence, I replicated the FD mount using problem solvers direct mount adapter and shimano...
02-28-17, 07:01 PM
Replies: 89
Views: 16,352
Posted By Turbotandem

In our recent gravel tandem build we had the down...

In our recent gravel tandem build we had the down tube matched in diameter to the bottom tube. Knowing the bulk of a tandems stiffness climbing and standing comes from those two tubes. Both are 60mm...
02-28-17, 06:45 PM
Replies: 89
Views: 16,352
Posted By Turbotandem

Whether inboard or outboard, the drive force is...

Whether inboard or outboard, the drive force is still more direct than a left side.

The left side forces from the captain need to transit the rear sprocket, thru the chain ring bolts, down thru...
02-28-17, 02:00 PM
Replies: 89
Views: 16,352
Posted By Turbotandem

Super interesting. I call this...

Super interesting.

I call this configuration an "outboard right side drive" to distinguish it from "inboard right side drive". The outboard configuration produces a greater bending forces in the...
02-28-17, 08:57 AM
Replies: 81
Views: 16,573
Posted By Turbotandem

...and now that you have been on the road in real...

...and now that you have been on the road in real life, what did you determine? What is your impression?
02-28-17, 08:53 AM
Replies: 81
Views: 16,573
Posted By Turbotandem

spider brace

I may have neglected to describe a brace I had made for the drive spider. One Lightning spider years ago broke on my tandem for a double ring so I am cautious. The triple spider looks pretty good but...
02-27-17, 10:33 AM
Replies: 114
Views: 21,480
Posted By Turbotandem

Yes, I would think the timing spiders would...

Yes, I would think the timing spiders would undergo the same see-saw action as the captain and stokers pedal strokes potentially counter each other at times. But you're right, for some reason I've...
02-26-17, 08:26 PM
Replies: 114
Views: 21,480
Posted By Turbotandem

Our expierence with lightning drive side spider...

Our expierence with lightning drive side spider is that the action of the captain's pedal stroke coming thru the spider in a CW force, then at time the captain's stroke pauses while the stoker pushes...
11-08-16, 08:50 PM
Replies: 114
Views: 21,480
Posted By Turbotandem

Since the caliper mounting point on the fork are...

Since the caliper mounting point on the fork are always the same, when you move the caliper away from the mounts to accommodate a larger rotor, you are basically mounting the caliper on a lever are....
11-06-16, 09:10 PM
Replies: 114
Views: 21,480
Posted By Turbotandem

Understood. But I was careful to say "for the...

Understood. But I was careful to say "for the same deceleration rate", not for the same force applied to the caliper. If one wants to decelerate, say approaching a stop light going from 20 to zero in...
09-29-16, 06:02 PM
Replies: 114
Views: 21,480
Posted By Turbotandem

Your results will be interesting. For a skilled...

Your results will be interesting. For a skilled descender the most problematic braking case may be when stuck behind traffic, or maybe in the rain when slower speeds are requisite. For my home state...
09-29-16, 12:58 PM
Replies: 114
Views: 21,480
Posted By Turbotandem

Of course one modulates, but there is only so...

Of course one modulates, but there is only so much heat dissipation capacity between the two brakes on steep or long descents; both rotors get plenty hot. I am one of those several people who has...
09-29-16, 10:00 AM
Replies: 114
Views: 21,480
Posted By Turbotandem

For sure semi metallic pads transfer the heat to...

For sure semi metallic pads transfer the heat to the caliper and oil, compared to organic pads. I have trouble with semi metallic squeezing as I use the disc for a lot of drag brake function in the...
09-29-16, 07:05 AM
Replies: 114
Views: 21,480
Posted By Turbotandem

Trekking calfee

Nice work. Thoughtful, you've been reading a few forums!
Agreed on the synchro shifting.
I have the same shift lag at cog 7 and 8, maybe the same wide gap to the pulley wheel at that point. It...
08-17-16, 12:49 PM
Replies: 81
Views: 16,573
Posted By Turbotandem

I have accessed the 16 point adjustment for FD...

I have accessed the 16 point adjustment for FD position both by the on-bike display, and thru e-tube. Can't say where I found that. I am on the most current e-tube software which only runs on windows...
08-17-16, 12:22 PM
Replies: 81
Views: 16,573
Posted By Turbotandem

2x11 XTR Di2 progress

Our builder at this point has done (2) tandems 2x11 Di2 XTR with drop levers and (2) 3x11. Spacing is working on all of them. On all of them the program adjustment (which can be done via e-tube...
06-24-16, 10:30 PM
Replies: 81
Views: 16,573
Posted By Turbotandem

SC-M9050 version 3.0.2 SM BTR2 ver 3.0.10 ST...

SC-M9050 version 3.0.2
SM BTR2 ver 3.0.10
ST 6770 ver 1.0.1
RD M9050 SGS 3.0.7
FD M9050 ver 3.4.1
06-12-16, 04:21 PM
Replies: 81
Views: 16,573
Posted By Turbotandem

I like it, along the same lines I was thinking...

I like it, along the same lines I was thinking for our back-country rig needing lots of gear when loaded. My feeling is that the teeth difference is based on chain wrap, which is fully solved by...
06-06-16, 10:27 PM
Replies: 81
Views: 16,573
Posted By Turbotandem

I checked tonight and the e-tube software tells...

I checked tonight and the e-tube software tells me the firmware of certain components is out of date, but it does not say the version. Maybe if I hit the button that says "update" it would but I...
05-31-16, 06:02 PM
Replies: 81
Views: 16,573
Posted By Turbotandem

Compared to the whisky fork 43mm offset on 396...

Compared to the whisky fork 43mm offset on 396 axle to crown, the new 70mm offset 410 axle to crown, that has reduced trail from 65mm to 37mm and reduced flop from 18 to 10. That's with 45mm tires....
05-27-16, 11:19 PM
Replies: 81
Views: 16,573
Posted By Turbotandem

Finally got the custom Black Sheep titanium fork...

Finally got the custom Black Sheep titanium fork mounted on our tandem. I am super pleased with the ride! 70mm offset on a cyclocross length 410mm AC is a geometry you'll only see on a tandem, and...
03-22-16, 01:21 PM
Replies: 81
Views: 16,573
Posted By Turbotandem

The frame was $7,200 including all the custom...

The frame was $7,200 including all the custom upgrades (60mm downtube, swept stays, internal wiring ready, and 44mm headtube). That includes a headset which gets mounted in the frame, but without...
03-22-16, 01:07 PM
Replies: 81
Views: 16,573
Posted By Turbotandem

Well, I don't know about the capabilities to run...

Well, I don't know about the capabilities to run Synchro shifting on your set up. On mine, Ultegra 6770 shifters and all XTR for the balance, synchro shifting functions and as such allows me thru the...
03-21-16, 07:14 AM
Replies: 34
Views: 7,097
Posted By Turbotandem

See more facts about my di2 setup with...

See more facts about my di2 setup with operational synchro shifting here: http://www.bikeforums.net/tandem-cycling/1038612-gravel-tandem-project-2.html#post18624475
03-21-16, 07:10 AM
Replies: 81
Views: 16,573
Posted By Turbotandem

Healthy skepticism. I will say I have been...

Healthy skepticism. I will say I have been diligent to NOT upgrade whatever firmware version I currently have for fear that doing so will irrevocably break what is currently working.
03-20-16, 10:22 PM
Replies: 81
Views: 16,573
Posted By Turbotandem

My LBS serves the pro's here in Boulder with a...

My LBS serves the pro's here in Boulder with a direct line to Shimano, and they were confident, at the least it would work by simply disconnecting the left shift lever, front derailleur switch. Why...
03-19-16, 07:43 PM
Replies: 81
Views: 16,573
Posted By Turbotandem

The unladen bike weight is coming in at 30#...

The unladen bike weight is coming in at 30# meaning without the bags but everything else shown. The new fork will add some weight and we'll have a larger front tire. So maybe 31# at that point. The...
03-19-16, 07:33 PM
Replies: 81
Views: 16,573
Posted By Turbotandem

As far as the bottle mount vs bags, I am carrying...

As far as the bottle mount vs bags, I am carrying hydration bladders (170oz total), in the top two frame bags. And then I made a little bar on the down tube bottle mount to lower the down toward the...
03-19-16, 07:23 PM
Replies: 81
Views: 16,573
Posted By Turbotandem

Oh, another custom component in the works is that...

Oh, another custom component in the works is that I was able to get Blacksheep to agree to design a custom Ti fork with wider clearance than the Whiskey Cross, a 410AC and 70mm offset which will help...
03-19-16, 07:18 PM
Replies: 81
Views: 16,573
Posted By Turbotandem

Twocycle, thanks for helping me keep updated!...

Twocycle, thanks for helping me keep updated! I've been busy riding and working. The bags turned out nice from JPak. We have one more rear bag on the way to make the set. We found ourselves coming up...
03-19-16, 06:58 PM
Replies: 81
Views: 16,573
Posted By Turbotandem

Indeed the synchro shifting works! It was well...

Indeed the synchro shifting works! It was well confirmed before the build that the Ultegra 6770 drop shifters would work with the XTR derailleurs, but there was some uncertainty as to whether the bar...
12-01-15, 01:40 PM
Replies: 81
Views: 16,573
Posted By Turbotandem

Good point. We'll have an X-Lab Gorilla cage...

Good point. We'll have an X-Lab Gorilla cage (CAGES AND BOTTLES (http://www.xlab-usa.com/products/cages-and-bottles.html)) we chose their "38g" version so Kami is able to extract the bottle. Her's is...
12-01-15, 01:35 PM
Replies: 81
Views: 16,573
Posted By Turbotandem

Our studio pictures came in. The metallic...

Our studio pictures came in.
The metallic brown shows well how different lighting makes it different colors.
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11-21-15, 10:29 PM
Replies: 81
Views: 16,573
Posted By Turbotandem

We run both CDC and CDX belts on different...

We run both CDC and CDX belts on different tandems at about 65psi, well below the 85psi recommended by Gates. Below that I find the wedge shaped teeth of the belt ride up on the sprocket under...
11-21-15, 07:25 PM
Replies: 34
Views: 7,097
Posted By Turbotandem

The "monster cross di2 tinkering" article posted...

The "monster cross di2 tinkering" article posted by twocycle suggest the FD can shift up to 48t chain ring.

Q. I do not believe there is a real difference between 10 and 11 speed chain rings. This...
11-21-15, 04:14 PM
Replies: 81
Views: 16,573
Posted By Turbotandem

The frame is belt length, but we find on dusty...

The frame is belt length, but we find on dusty rides that the tight belt induces quick wear on the sprockets. The chain and sprockets seems to do better in a dusty environment. I'd looked at bash...
11-21-15, 03:30 PM
Replies: 34
Views: 7,097
Posted By Turbotandem

Super post twocicle! One thing readers could...

Super post twocicle! One thing readers could consider is a cross bike with 74mm bottom bracket should resolve any tight spacing issues. And to be clear the xtr di2 3x11 road can be made to work as...
11-20-15, 03:11 PM
Replies: 81
Views: 16,573
Posted By Turbotandem

Twocycle, more info on the road triple lightning...

Twocycle, more info on the road triple lightning spider just posted here: http://www.bikeforums.net/tandem-cycling/1031377-shimano-di2-xtr-3x-mechanical-disc-brakes-2.html#post18334233
Showing results 1 to 50 of 233
 


 
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