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This thread started with me discussing design details as I designed our custom ti fat mtb tandem. Fast forward 4 months and here she is.
Goals were to run the largest possible tires (5.05"), good fit for us as smaller riders, retain the ability to run dropper posts, give her a little more room to see in the back, and have the largest/most powerful brakes possible.
Here's the finished product.
Specs:
Head angle 68 degrees with a 483 A-C fork like the Surly ICT
Seat tube angle 73 degrees
Wheelbase 1900 mm
BB drop 40mm
Front top tube actual 575.8mm effective 590mm
Rear top tube 760 c-c on the two seat tubes and 580 effective for stoker's handlebar attachment seat tube
3rd "seat tube" for stoker so that her bars are free from mine and so we can both run droppers
Chainstays 465mm
Bent seat tube (stolen shamelessly from our Surly fat bikes, which we love)
31.8 seat tubes (all 3) and solid posts (for now)
Components:
780mm bars, stoker will likely cut hers to 740ish
60mm stem for captain, stoker probably going to go shorter, 35mm is on order
Raceface Ride cranksets, 2x spider, 22t timing chains, 32t main drivetrain ring, bash guard on front, all 12 speed Eagle chains on both.
54mm bottom bracket eccentric, 100mm wide for fat
Manitou Mastodon Pro Ext 100mm fork
Vee Snowshoe 2XL tires. Rear didn't quite make it on the clearance and I snipped the lugs way up the sidewall off on one side to clear.
Onxy Classic hubs laced to Surly MOBD 80mm rims, tubeless, SRAM XD hub, built by Mike @ lacemine29
SRAM GX 1x drivetrain, obviously a custom length shifter cable. 52-10 cassette
Magura MT7 Pro brakes with 220 mm rotors
Frame weight was 8.3 pounds before all the stuff I put on it. I haven't weighed it complete. Normally I don't care about weight but given that the tires are over 8 pounds by themselves I'm surprised how light it is.
We've had it out twice already and it is incredible so far. I can't wait to have more time to ride it.
Goals were to run the largest possible tires (5.05"), good fit for us as smaller riders, retain the ability to run dropper posts, give her a little more room to see in the back, and have the largest/most powerful brakes possible.
Here's the finished product.
Specs:
Head angle 68 degrees with a 483 A-C fork like the Surly ICT
Seat tube angle 73 degrees
Wheelbase 1900 mm
BB drop 40mm
Front top tube actual 575.8mm effective 590mm
Rear top tube 760 c-c on the two seat tubes and 580 effective for stoker's handlebar attachment seat tube
3rd "seat tube" for stoker so that her bars are free from mine and so we can both run droppers
Chainstays 465mm
Bent seat tube (stolen shamelessly from our Surly fat bikes, which we love)
31.8 seat tubes (all 3) and solid posts (for now)
Components:
780mm bars, stoker will likely cut hers to 740ish
60mm stem for captain, stoker probably going to go shorter, 35mm is on order
Raceface Ride cranksets, 2x spider, 22t timing chains, 32t main drivetrain ring, bash guard on front, all 12 speed Eagle chains on both.
54mm bottom bracket eccentric, 100mm wide for fat
Manitou Mastodon Pro Ext 100mm fork
Vee Snowshoe 2XL tires. Rear didn't quite make it on the clearance and I snipped the lugs way up the sidewall off on one side to clear.
Onxy Classic hubs laced to Surly MOBD 80mm rims, tubeless, SRAM XD hub, built by Mike @ lacemine29
SRAM GX 1x drivetrain, obviously a custom length shifter cable. 52-10 cassette
Magura MT7 Pro brakes with 220 mm rotors
Frame weight was 8.3 pounds before all the stuff I put on it. I haven't weighed it complete. Normally I don't care about weight but given that the tires are over 8 pounds by themselves I'm surprised how light it is.
We've had it out twice already and it is incredible so far. I can't wait to have more time to ride it.
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