Stonegrinding

Refresher Grind
Like a standard stone grind but with fewer passes over stone. Best suited to quickly remove minor base damage to get skis optimally up to speed for important races. Only available for skis previously ground by Finn Sisu within the last 2 years to ensure flatness.
Prepay
Refresher Grind
$40.00

Like a standard stone grind but with fewer passes over stone. Best suited to quickly remove minor base damage to get skis optimally up to speed for important races.

Only available for skis previously ground by Finn Sisu within the last 2 years to ensure flatness.

Stonegrind
A three-step process that first involves flattening and removing damaged base material cause by frequent cold wax ironing and constant skiing on cold abrasive Midwestern natural and man-made snows. Ski bases are then ground smooth before a final structure (a pattern of etched lines) is applied that has been researched and glide tested to confirm exceptional glide characteristics. Lastly, bases are brushed, treated with Rex glide cleaner, and coated with Rex base oiled under a layer of soft wax.
Prepay
Stonegrind
$80.00

A three-step process that first involves flattening and removing damaged base material cause by frequent cold wax ironing and constant skiing on cold abrasive Midwestern natural and man-made snows. Ski bases are then ground smooth before a final structure (a pattern of etched lines) is applied that has been researched and glide tested to confirm exceptional glide characteristics. Lastly, bases are brushed, treated with Rex glide cleaner, and coated with Rex base oiled under a layer of soft wax.

 
Stonegrind w/ Prep
Identical to a standard stonegrind except with additional glide wax hardening, a necessity for Upper Midwestern natural and man-made snows. Includes coats of blue and green non-fluorinated glide waxes with the option for either a solid or liquid application.
Prepay
Stonegrind w/ Prep
$90.00

Identical to a standard stonegrind except with additional glide wax hardening, a necessity for Upper Midwestern natural and man-made snows. Includes coats of blue and green non-fluorinated glide waxes with the option for either a solid or liquid application.

 

Skate Grind Menu

FAC5 III - Approximately 0° to 10°F — Cold dry abrasive manmade or natural, hard or soft snow.
FAC5 11 - Approximately 12° to 30°F — Uni range. Cold dry abrasive manmade or natural, hard or soft snow.
YD42 - Approximately 30° to 35°F — Moister snow, about when you can start making a snowball.

Classic Grind Menu

WSL II - Approximately 0° to 10°F — Manmade or natural snow.
WSL 42 - Approximately 12° to 30°F — Uni range. Manmade or natural snow.
BW83 - Approximately 30° to 35°F — Tracks becoming wet but not saturated.

❄Wax and Grind Testing Protocol❄

*Customer can consider hand structuring over any of the above grinds. Additional grinds exist off-menu for narrower ranges. Call/email Tom Novak ([email protected]) or come in for recommendations.

**Note—Some skis that come in for stonegrinding have bases that are excessively uneven. This can be due to simple wear or some manufacturers choice of proprietary core materials that have a high susceptibility to thermal damage (i.e. when waxing skis). Tom strives to get skis flat, but it is not always possible—your ski base has only so much polyethylene.


Sandpaper…

Hand files…

Belt grinders…

Metal Scraping…

Stone grinders…

The evolution of Nordic ski base maintenance.

 
 
 

In 1993, Finn Sisu purchased the first stonegrinding machine dedicated to Nordic ski maintenance in the Upper Midwest—the Austrian built Wintersteiger Micro 1. A state of the art tool to refinish Nordic ski bases, the Micro 1 allowed Nordic skiers to benefit from the same technology that alpine skiers had been benefiting from for years. No longer needing to spend hours in the basement meticulously sanding and/or metal scraping their ski bases, skiers flocked to the original store location on University Ave in Saint Paul, MN to have their ski bases mechanically ground, flattened and structured. Over time, other Upper Midwest ski retailers invested in their own stonegrinding machines, contributing to a wealth of grinds that skiers could choose from to make their skis faster.

 
 
 

As ski structures evolved, so too did the capabilities of stonegrinding machines. Fast forward to 2015 and Finn Sisu decided to raise the bar for Nordic ski maintenance once again with its purchase of the Wintersteiger Omega RS 150—a semi-automated stonegrinding machine with software that rivaled that of some of the most advanced machines out there. One of only five in the United States at the time, the Omega RS 150 was built-to-order, with each subsequent machine produced being an upgrade over the previous. Paired with the more aggressive Micro 1, the new Omega RS 150 and Micro 1 perfectly complemented each other, with the Micro 1 flattening and thoroughly removing damaged base material, and the Omega RS 150 cleaning and carefully structuring the blanked base.

 
 
 

Around rolls 2020 and, in the midst of other prominent events, Paul Suomi from Vail’s Ski and Snowboard Academy offers Finn Sisu the opportunity to acquire a Wintersteiger Race NC, the finest, fully programmable stonegrinding machine Wintersteiger offers. With a total of only 11 of these machines in existence, and only 2 of those 11 machines residing in the United States, Finn Sisu jumped at the chance to move 1 of those 2 machines to the new store location in Lauderdale, MN. Used almost exclusively by ski manufactures like Salomon, Atomic, and Fischer, and national ski teams like Austria, Germany, Sweden, and Norway, these CNC machines produce the most accurate and precise structures grind techs can dream up. Working in tandem with the Omega RS 150, the Race NC and Omega RS 150 make, arguably, the most capable duo of stonegrinding machines anywhere in the United States with the potential to deliver some of the best grinds available to skiers in the Nordic racing community.

 
 
 

At the end of the day, the relationship between Finn Sisu and Wintersteiger spans nearly three decades in addition to three stonegrinding machines. Located in Salt Lake City, UT where they warehouse parts and supplies, Wintersteiger USA’s excellent customer service has been paramount to the closeness of this relationship, with Wintersteiger USA offering real-time tech support alongside their team of regional tech representatives who provide onsite consultations and servicing for their machines.

 
 
 

If you have any questions, theories, or just want to talk about structure, feel free to contact Tom Novak at Finn Sisu: 651-645-2443 or [email protected]