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Stronglight Cranks & Cranksets
 

We sell Stronglight Impact cranks, (just the arms) as well as complete cranksets. The Impact Triple works with a 115mm JIS square taper bottom bracket with a chainline of 45mm. We stock two different Stronglight bottom brackets to fit. Other brands will work of course, provided the axle length is correct and the tapers are JIS.

The cranks are available in 165mm, 170mm, 172.5mm and 175mm. The bolt circles are 110mm for the outer and middle rings, and 74mm for the inner ring. You get the best pricing when you buy a complete crankset with one of three stock chainring sizes. Stock chainring sizes are 52-42-30, 48-38-24 or 48-36-24. Of course many other chainring options are available, but at a somewhat higher price.

Impact Tandem cranks are also available. The crank length is 170mm captain & stoker. The stock chainrings are 53-39-28.

Crankset fans may notice a strong similarity in appearance to a certain Sugino crankset. And indeed the Impact is forged at the same foundry as that Sugino crank, and it starts out as the same forging. But there's a critical difference.

The studs that hold the inner chainring, the 74mm bolt circle studs, are a few millimeters longer on the Sugino. Sugino makes a unique middle chainring which flares to the inside, pushing the chain further to the inside when you downshift from the middle chainring to the inner chainring. I don't know why Sugino does this, but it shifts just fine with most front shifters. I've never tried it with Shimano's STI. But I suspect it won't work. The real problem arises when the chainrings wear out, which happens fairly quickly as the chainrings are made of a relatively soft aluminum, and Sugino doesn't make chainrings for that crank in the harder 7075-T6 aluminum.

The Impact crank has industry standard chainring spacing. The studs for the 74mm inner ring are shorter than on the Sugino crank, and you can fit Stronglight's 7075-T6 chainrings as well as 7075-T6 rings from other manufacturers.

Since one of the chainring mounting points is directly behind the right crank, using a standard nut to take the chainring bolt can be difficult as it can spin and it's difficult to keep it from spinning as you tighten the bolt. Stronglight makes a special nut that grips the middle chainring, so it can't spin as you tighten the bolt. The chainring bolt set for the Impact cranks includes one of these special nuts.

The Impact cranks come with auto-extractors installed.

 

Impact Triple Cranks
     

crank

Stronglight Impact Triple crank arms
     
STR125153 Stronglight Impact arms only, 110/74, 165mm silver $94.00
STR125027 Stronglight Impact arms only, 110/74, 170mm silver $94.00
STR125159 Stronglight Impact arms only, 110/74, 172.5mm silver $94.00
STR125163 Stronglight Impact arms only, 110/74, 175mm silver $94.00
     
STR125594 Stronglight Impact Triple Tandem rear 170mm JIS silver 110mm arms only $104.00
     
STR350028 Stronglight bolts for Impact triple with special nut $18.00
     

Impact Triple Cranksets with 7075 T6 Chainrings

Our Stock Assortment

     

crankset

Stronglight Impact Triple crankset shown here with the Stronglight JP400 115mm JIS bottom bracket. We stock these in both British and Italian threading. Auto-Extractors are included.
     
STR125582 Stronglight Impact Triple Crankset, 165mm silver, 7075-T6 52-42-30 $210.00
STR125583 Stronglight Impact Triple Crankset, 170mm silver, 7075-T6 52-42-30 $210.00
STR125584 Stronglight Impact Triple Crankset, 172.5mm silver, 7075-T6 52-42-30 $210.00
STR125585 Stronglight Impact Triple Crankset, 175mm silver, 7075-T6 52-42-30 $210.00
     
STR125586 Stronglight Impact Triple Crankset, 165mm silver, 48-38-24 7075-T6 $210.00
STR125587 Stronglight Impact Triple Crankset, 170mm silver, 48-38-24 7075-T6 $210.00
STR125588 Stronglight Impact Triple Crankset, 172.5mm silver, 48-38-24 7075-T6 $210.00
STR125589 Stronglight Impact Triple Crankset, 175mm silver, 48-38-24 7075-T6 $210.00
     
STR205508 Stronglight JP400 bottom bracket, JIS, hollow axle, 115mm aluminum cups, BSC threading $45.00
STR205521 Stronglight JP400 bottom bracket, JIS, hollow axle, 115mm aluminum cups, Italian threading $45.00
STR205642 Stronglight JP400 bottom bracket, JIS, hollow axle, 115mm plastic cups, BSC threading $24.00
     

Impact Triple Cranksets with 7075 T6 Chainrings

Pick Your Own

     

You can create your own Impact crankset with the Stronglight 110mm & 74mm chainrings of your choosing. Pick the crank length you want from the four listed near the top of this page, add the three Stronglight chainrings and the Stronglight chainring bolts, then subtract 10% from the total.

See my Stronglight Chainring page for the wide selection of chainrings available.

   

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This page updated: Monday, May 20, 2019

Peter White Cycles LLC
24 Hall Rd.
Hillsborough, NH 03244
USA
603 478 0900 Phone
603 478 0902 Phax