Are Fuji SIC guides really as brittle to impact as people say they are? How hard of an impact can cause them to crack/break? Looking at the Shimano Expride B Series casting rods in particular. 

I’m not an engineer but I’ve often heard this, as far as a user, I like them a great deal. I’ve several rods with sic, zirconia, alconite, aluminum oxide. I’ve had one salt rod with aluminum oxide crack.. 

 

Fish with confidence. 

While I do take care of my gear and treat it in a manner that promotes longevity,

the few times I've blown up a guide or fractured an insert,

I'm pretty sure it wouldn't have mattered what it was made of.

The survival rate was going to be very low.

Like I said, that's a rare occurrence.

So I say go with whatever guides you prefer 

and just get to casting.

A-Jay

 

 

SiC guides are fantastic guides and have been around for at least 25 years.  If there was a problem with them, they would not have lasted that long.

 

I suspect the “as people say they are” is a relative term here.  If you’re not a significant rod abuser, and someone considering an expride likely isn’t, they you should have no problems.  

All ceramic materials are brittle.  Hardness decides how they wear when other hard materials like sand are dragged across them.  

Electroless nickel - 600 HV (Vickers hardness scale - nominal values)

Hardest knife edge - 700 HV

Hard Chrome - 1000 HV

Carboloy (Mildrum) 1500 HV

Alconite hardness - 1700 HV

Silicon nitride - 1800 HV

Sand - 1800 HV, so sand will wear Alconite, and may wear SiN.  

Silicon Carbide and Torzite are comparable hardness, 2400 HV, though Torzite is 40% lighter than SiC.  

 

Natural agate, btw, is also quartz, the same mineral as sand, and was used on rod and line guides for 100 years before man-made ceramics.  1914

Because of the natural mineral crystal imperfections, this stuff is a lot more brittle than silicon carbide.  1935

its thin ceramic, of course it's brittle. Not sure why you'd be hitting them, though.

Wouldn't worry about it. Fuji Sic and alconites are the best in the industry.

Keep in mind the SIC guide ring is held in place with a metal guide frame. To damage the SIC ring you must 1st damage the guide frame. If you toss your rods down the guide frame can be bent, usually towards the rod blank and that doesn’t crank the SIC ring. Banging the rod tip hard against something harder can crack the top guide insert or break the rod tip off.

If you use braid it’s abrasive wearing a groove in softer guide ring materials, SIC solves that problem.

Tom  

I don't think I broke a guide insert/ring as much as lost due to poor seating in the guide frame itself. Not sure if it was a manufacturing process or not but I've had my share of winter projects replacing them.

I have never had any issues with sic or alconite guides on my rods so durable enough I guess, but I also baby my equipment so that's a big factor 

Since Fuji decided to axe the Ti Alconnite guides, Ti Sics have become the best value guide IMO.  I still use rods with everything from Type Os to Torzites and Havent cracked any eyes in close to 10 years.  Ive heard that SiC guides are prone to hairline cracks, but Ive never had problems with either the slim or standard SiC.  Torzite guides are as hard as alconite, but are as thin as slim SiCs, offer the least friction and great durability for a noticeable increase in price, more so than Fazlite/Alconite to Ti Sics.  For FW fishing I would worry more about the blank than the guide train so long as its Fuji Faz/Alc or better.

 

I've tried to have any rod I purchase have at least Fuji Alconites. They cast smooth and are durable.

 

The only guide ring I have ever had crack was a sic one off of a Fenwick CoFi 57 rod from the late 90s. 

Fuji SIC guides are high quality components. Use them without hesitation. Anecdotal tales to the contrary most likely are missing details and / or context. 

I'm a huge fan of SIC.  One of the best guides on the market.  I've also built a rod with Torzite.  Those are even better but man are they expensive.

Titanium framed SiC was my high end guide of choice for long steelhead rods like 13’ float rods and ultralight 11-12’ spinning rods.  The single foot fly guides were similar weight to a wire fly rod guide but with the added line protection of the SiC ring.  But they definitely are/were expensive.  Almost $100 for a set of guides for a rod like that.  But there were things you could do with those that weren’t achievable otherwise.  I can’t imagine what torzite would be like.  

I have Ti-frame Torzite on two high-end salt shore finesse spinners, Yamaga Blanks TZ Nano, and EverGreen Sweep Master - amazing how light these 8+ to 9+' rods

73 g

91 g

On 11/11/2025 at 5:58 PM, Jonny15678 said:

Are Fuji SIC guides really as brittle to impact as people say they are? How hard of an impact can cause them to crack/break? 

 

As others have said don't worry about it if you take good care of your rods.

 

But as far as how hard of an impact can break, crack, or damages the inserts.

 

If you had a rod say standing upright on a tile or hard floor, and rod is leaning against the wall. If it were to slide over sideways and tip of rod smacks down on the tile floor could be enough to damage guide inserts. I've done it. And the guide frames were undamaged.

 

I read a comment recently that stated the guide frames have to be bent or damaged in some way before the insert can be broken and I have not found this to be true.

 

Just this week I have removed guides from two different rods with partially broken inserts.

 

This first broken guide is from a spinning rod. It is a 4mm micro guide removed from close to the rod tip. The insert is chipped, and this broken insert was cutting line. Frame is undamaged but this fuzzy enlarged image shows the gap of missing insert material chipped off the front side of the guide leaving behind a very sharp edge on inside of this guide where line flowed.

 

If an insert is 360 degrees around, then this guide here had a good 30 or 40 degrees of insert missing and cracked off, and a very sharp edge like a knife where line flowed. Bad news right here!

 

 

This next guide is from a baitcast rod. It is missing some of the insert that cracked off the top center of the guide, but was as yet still not reaching center of insert and line flow was not compromised nor being cut yet by this guide.

 

But if you notice the white line across the bottom of guide insert shown here, that is a similar crack across the insert nearly identical to the missing cracked off material on top side of guide. 

 

You can see a small part of this crack did reach the center of the guide and if this material had cracked off the guide like the top side did, there is a small section where a sharp edge would have been presented to the line flowing through it possibly causing line fraying and could also cut line.

 

 

Point is, both of these guides broke without damage to the frames. And something as simple as a rod leaning against a wall sliding over sideways to the ground, and smacking any one of its guides on a hard floor can cause this type of damage. Frames do not have to be compromised for this to happen.

 

On both of these rods, the owners did not even notice these damaged guides and got lucky no line was cut for them.

 

On every rod I get, I use my finger tips to feel both sides of every insert on every guide checking for roughness or sharp edges. If my fingers tell me something is there, out come the super duper magnifying glasses for a closer examination.

 

I don't think any of us want to be out on the water setting the hook on a big bass when the line is instantly cut clean through on broken guides like these. It always seems to show up on bigger fish for sure.

 

Use any guides you choose. SIC guides or torzite or alconite or zirconia or titanium oxide or whatever you want, but treat all them the same and you should be fine.

 

I'd say every one of them will crack and shatter with similar forces applied, so maybe one breaks quicker than another, who knows, but they all break when abused and all need the same or similar care to prevent this type of damage which is unfortunately often not caught when off the water, but surely shows up on the water!

 

I think A-Jay got it right with this comment: "... the few times I've blown up a guide or fractured an insert, I'm pretty sure it wouldn't have mattered what it was made of."

 

I completely agree. But it is a good idea to check them before fishing to avoid finding out the hard way on that next big one!