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Discussion Starter · #1 ·
For those of you running an SRS on your 7points, what size bash guard are you using? I have a 36T on right now and I end up hitting the lower boomerang arm too often. I'm thinking that a larger diameter bash would provide more protection for the boomerang arm. Any thoughts? (I have an e-mail into e-13 tech support to determine the diameter measurements for their Supercharger sizes).

toby
 

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I'm running the OEM 36T bashguard as well and have the exact same problem.

Oddly enough I had this same thought earlier today but I mulled it over and realized if you increase the bashguard size you'll have to move the lower roller out farther, and it won't change the angle or distance to the ground relative to the bashguard in the end.

I would do it but I want to sell my larger 40T e13 Bashguard as unused ($30!).

Well, that's my theory anyways. You should give it a try though.
 

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Interesting thoughts...

HBT interesting feedback on the SRS. I'm running the Raceface Diabolus single chainring retention system and have the same problem. I thought about switching to the 36-tooth SRS, but suspected I might run into the same problem. Actually I was thinking of taking my dremel to the lower guide and removing as much material as I without sacrificing the system.

Any other ideas on torquing the systems down tighter to keep them from rotating? Although I guess it's sort of a hard thing to compress something tight enough to keep it from rotating when hit laterally...or I guess that's what the frame mounted ISCG tabs are for hmmm...maybe I should sell my '06 frame and buy an '07 frame when they come out...;)

Auk
 

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I'm with you on the dremel. I have one, plus an angle grinder, that I've thought of using to grind down the lower portion of the boomerang, the end tip of the boomerang, and the plastic on the inside of the lower jockey wheel (where it rubs the swingarm when it eventually gets rotated up into the linkage).

The best I have been able to do is this...

Take the boomerang and rotate it on the adapter so that when it takes an impact instead of rotating clockwise IN the adapter that the whole adapter and boomerang rotates as a whole. This seems to make it harder to rotate the whole thing because I then torque the bejesus out of the drive side external BB cup and don't have to worry again about fiddling with both the adapter AND the 3 mounting bolts when it eventually rotates again.

Aside from that I may ditch the SRS completely and get something that can be tucked up out of the way better. Maybe an MRP? I dunno, but it is basically an "every ride" kind of thing because I tend to plow into stuff.
 

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Oh and as for DW, bless his creative mind and all that.... he can be an anti-ISCG tab zealot all he wants, but at the end of the day his decision to forego the tabs makes my life a tiny bit miserable as an end-user who can't understand why I have to go through readjusting the system after or during every ride.
 

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Discussion Starter · #6 · (Edited)
Here are the diameter dimensions that I received from e-13 for their various Supercharger sizes: 36T - 170mm, 40T-184mm, 42T-193mm

I haven't decide whether a larger bash will work quite yet either. I also think that maybe removing some of the "fin" (about 3/8") from the lower plastic piece would allow the boomerang to get tucked up underneath a little better. All I know is that I need a way to prevent the bommerang from taking the impacts and rotating into the frame. I scanned the set-up instructions from e-13's website again last night and completely re-instaslled everything again this afternoon. I paid special attention to making sure that there was no grease between the BB mount and the boomerang and tightened everything down - real tight. We'll see how it holds this weekend. What size bash is stock on a Sunday out of curiosity? Any other opinions? Ska-Todd? dw?

toby
 

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Discussion Starter · #7 ·
It looks like a Sunday comes stock with a 40T chainring. So maybe it has a 40T or 42T Supercharger? I don't know if the 2 frames are all that similar in dimensions around the BB and chainstays. Or if it's a occurence on the Sunday at all. Oh ya, those frames have '05 ISCG tabs.

I may break out the Dremel tonight.

toby
 

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Discussion Starter · #8 ·
Here's the small mod I did with a Dremel to the e-13 plastic piece:



This allows the boomerang to get tucked up a little closer to the chainstay. Hopefully, most impacts will be taken by the bash guard now. We'll see how it holds up this weekend during some DH runs.

toby
 

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My solution is much better. Use the STS guide. It is much more hastle free. This is my profile:

38T
STS guide
36 Bashguard.

It takes a little setting up but it works way better than drilling, cutting, or getto modification. I rotated the guide as close the chain stay as possible and it is very clear of the ground. The guide clears the guard.

Here was the tough part to figure out. With a 38T you need to set the top plate right. At first it will rub a little but as it wears the chain will sit better. You also have to set the back bolt into the upper holes.
 

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Discussion Starter · #12 ·
Wyrm - That's interesting - using the STS. I was told specifically by e-13 that the dimension of the STS shorter boomerang wouldn't clear the dropped chainstay. If it does work well, this may be a better option as you stated. Have you had any other issues with that set-up? I'll see how mine ghetto set-up holds tomorrow.

toby
 

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It is a tight fit initially but later as some of the plastic wears off it will fit like a glove. So it will be loud initially. But as you can see mine works just fine. The reason I chose to go with the STS was because it would give more ground clearance. If it didn't work I was prepared to make the switch with someone else for a SRS. I have been running this set up for almost a year.
 

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Discussion Starter · #14 ·
Thanks, wrym. My "mod" didn't work. :madman: I slammed it against something again today. I'll be calling e-13 in the morning for an STS backplate and some new plastic.

toby
 

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Discussion Starter · #16 ·
wyrm said:
You ever get the STS and get it working?
No, I didn't get an STS yet. I talked with e-13 at length about the differences and decided to stay with the SRS right now and maybe add a 40T bash instead. E-13 was stating that an STS backplate would add an excessive about of drag on the chain/drivetrain due to the geometry differences (a shorter boomerang arm). Any experience with this - excessive drag? Premature pulley or chain wear? Tell me more.

I bent a retention bar on my Mallets this past weekend and I'm waiting on a warranty replacement, so I didn't ride much at all this week. I'm gonna set-up the guide again and see how another day of DHing with fair with my current set-up.

toby
 

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Drag...that is what I meant by "tight". Ya it does wear fast, but when it does wear it fits much better. My chain doesn't get thrown around and stays where it should. All of the drag will come from the upper plate. The lower roller when I took it off last nite was in great condition, so no premature wear there.
 

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in the trees said:
No, I didn't get an STS yet. I talked with e-13 at length about the differences and decided to stay with the SRS right now and maybe add a 40T bash instead. E-13 was stating that an STS backplate would add an excessive about of drag on the chain/drivetrain due to the geometry differences (a shorter boomerang arm). Any experience with this - excessive drag? Premature pulley or chain wear? Tell me more.

I bent a retention bar on my Mallets this past weekend and I'm waiting on a warranty replacement, so I didn't ride much at all this week. I'm gonna set-up the guide again and see how another day of DHing with fair with my current set-up.

toby
Have you made any headway with hitting the end of the boomerang yet?
Offically the STS guide will fit aroung the stays just for the record...
Give me a shout sometime and let me know how its going.
 
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