Bicycle Archive · Specification reportBicycle Archive · Specification reportVelopedia Archive ID 49008
| Model year | 2000 |
|---|---|
| Brand | Boulder Bikes |
| Model | Sirius |
| Bicycle type | Tandem (recumbent) |
| Archive ID | 49008 |
| Original MSRP | $5,499.00 |
| Colors | Buyer's Choice |
| Sizes | Adjustable for rider height |
| Weight | 46 lb |
| Frame construction | TIG-welded |
|---|---|
| Frame material | 7005 aluminum, butted w/replaceable derailleur hanger |
| Fork | Ballistic 600 XL, 1.0" travel |
| Fork material | Aluminum/chromoly, triple-clamp crown |
| Rear shock | Works Performance/Boulder Bikes Spring/Oil, 3.0" travel |
| Component group | Recumbent Mix |
|---|---|
| Shifters | SRAM Quartz |
| Front derailleur | Shimano Ultegra, bottom-pull/clamp-on 31.8mm |
| Rear derailleur | Shimano XTR SGS |
| Crankset | Sugino XD600 Tandem, 38/50/60 teeth |
| Bottom bracket | Shimano BB-UN72, 122.5mm spindle |
| BB shell width | 68mm English |
| Rear cogs | 7-speed, 11 - 30 teeth |
| Chain | SRAM PC-61, 1/2 X 3/32" |
| Pedals | Not included |
| Brakes | Magura HS 33 brakes, Magura levers |
|---|
| Headset | 1" threadless Chris King NoThreadSet |
|---|---|
| Handlebar | RANS Tilt Bar-Stem Combo |
| Handlebar extensions | N/A |
| Stem | RANS Tilt Bar-Stem Combo |
| Saddle | RANS recumbent seat |
| Seatpost | Control Tech Control Post |
| Hubs | Front: SRAM Plasma, Rear: SRAM 3x7 |
|---|---|
| Rims | Sun Rims CR18, 32-hole |
| Spokes | DT stainless steel, 2.0mm straight gauge |
| Spoke nipples | Brass nipples |
| Front tire | 20 x 1.50" |
| Wheel size | 20" wheels |
| Head-tube angle | 72° |
|---|---|
| Wheelbase | 740 mm |
| Fork offset / rake | 38.1 mm |
Manufacturer-published archive data. Confirm exact standards and dimensions before ordering parts or performing service. Generated by Velopedia on October 7, 2026.