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About the
TruVativ IsoFlow crankset
These are fairly basic, with a painted finish. Stock chainrings are
steel, but are ramped and pinned so shift reliably. Rings are
spaced for 8 or 9 speed chain.
BB spindle;
Square taper. 110mm will give the optimum chainline for a road bike,
recumbent or older MTB with 130mm spacing. 113mm is best with modern
MTBs or Tandems. If you currently have a107 or 115mm, I recommend
giving it a try. If it doesn't work you should be able to pick up the
right one at most larger bike shops.
For
standard bike parts, it's always best to support your local shops. But
if necessary, I can provide a Shimano UN-54 BB cartridge for $25.
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Q factor; 167mm with Shimano 110mm spindle. Great ankle
clearance.
Bolt Circle Diameter (BCD) The middle and outer ring
are 104mm BCD, inner is 64mm.
"Safely"
is a relative term. Modern cranks hopefully have a margin of safety to
allow for the occasional 280 lb mountain biker. Shortening will
obviously reduce this safety margin, as there will be less aluminum
around the pedal hole than before. But the IsoFlows are pretty beefy
wherever I put the new pedal hole.
Unless you are a very
large or strong rider on a non-recumbent, Knee Savers should be OK with
these cranks.
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IsoFlows with steel 22/32/42 MTB rings (153mm
shown)
160mm $79 - 120mm to 154mm $99
95 mm to 119 mm - $104
With the small chainrings, these are particularly suited for bikes with
large rear wheels. But about 20% have gone to trikers, with 20" rear
wheels, who are realistic about their gearing needs. |
IsoFlows with steel 28/38/48 "Trekking" rings
(140mm shown)
160mm - $90 120mm to 154mm - $110
95 mm to 119 mm - $115
To substitute a 26t Shimano ring add $9.
To substitute a 24t Truvativ ring add $11
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With 23-33-44 Rotor "Q" Rings (153mm shown)
160mm $369 - 120mm to 154mm $389
95 mm to 119 mm; $394
CNC machined in Spain from ultra hard 7075 aluminum. These
smooth out the uneven pedaling on recumbents. Expensive, but I'm
getting nothing but positive feedback from the over 25 sets I've sold.
We've got 7 recumbents and not a round ring on any of them. |
With 22-32-44 Race Face Chainrings (Other sizes available)
160mm $182 - 120mm to 154mm $202
95 mm to 119 mm; $207
CNC machined from ultra hard 7075 aluminum and
hard anodized, with steel ramps on the large ring. Quite possibly the
best round rings on the planet. Black "Team" rings same price. Photo here.
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A popular choice for younger
riders 
With 22-32 Race Face Chainrings and Bashguard (130mm Shown)
24-36-Bashguard Same Price
153mm - $169 95
mm to 152 mm; $174
Middle Ring and Bashguard CNC machined from ultra hard 7075 aluminum.
Inner ring steel
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New! TruVativ
Alloy Chainrings 
With 22-32-44 Chainrings
(140mm Shown)
160mm $157 - 120mm to 154mm $177 95
mm to 119 mm; $182
For steel inner ring, subtract $12
Alloy rings high pressure forged from ultra hard 7075 aluminum.
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